Indoor growing:Nutrient Deficiencies In Marijuana Plants
Do your plants have a nutrient deficiency?
Deficiencies are not the only possible problems your plants could have with nutrients. They could also have too much of something, including the three essential nutrients (Nitrogen, Phosphorus, and Potassium, or N-P-K). So how can you identify it?
First, reflect on whether what you have been feeding your plant has been entirely balanced, specifically with regards to N-P-K. After that, test the pH value of the soil and water that you’ve already been giving them. The nutrients deficiencies can be caused by many things, but the most significant factor is pH value. If the pH levels aren’t perfect, fix them. If they are balanced and your plants are exhibiting symptoms of being unhealthy, then it is possible that the issue is connected to the sunlight, as this is not easily controlled by you.
Before you get too confused or overwhelmed by the possibilities, make sure you are identifying it correctly. If your plants are receiving plenty of sunlight and balanced water, the chances are good that the problem lies with the nutrients.
Deficiency and excess of Iron in cannabis plants
Iron isn’t a mobile element and although it isn’t part of the chlorophyll, it does contribute to both the pigmentation and leaf respiration of marijuana plants. Furthermore, it also interacts directly in the enzyme production process. The plant can absorb it in the form of ferric ion (Fe++) although it can also be absorbed organically.
In most crops, deficiencies of this element are usually preceded by a PH value higher than 7.0 in the substrate, in which the plant can’t absorb Iron through its roots. Nor will it be absorbed in very alkaline or chalky soils.
There are other reasons why the plant won’t perform a correct Iron uptake even if it’s present in the substrate: high levels of carbonates, high salinity, constant humidity, low temperatures or excess of other micro-elements that may cause nutrient lockout.
In this case, the youngest leaves – those of the upper part of the plant – will show ferric chlorosis, keeping their veins green. If this symptom isn’t treated, the leaves will become discoloured, with green veins.
Advance of Iron deficiency
Plants use different and varied ways to absorb the Iron contained in the substrate. Through chelating mechanisms – based on the creation of Siderophores that act sinergically with different bacteria – Iron becomes much more profitable for cannabis plants.
Deficiency and excess of Copper in cannabis plants
Copper deficiency is a rare mineral deficiency that can be easily corrected. That’s provided you detect it and react fast. Copper deficiency is so uncommon that many growers have no idea what is blighting their cannabis plants.
SYMPTOMS OF COPPER DEFICIENCY
In the beginning, top leaves will look overfertilised with yellow fringes. Rapidly, green tops will turn an odd metallic bluish tone or may look bleached. Not the typical chlorosis associated with other nutrient deficiencies. As an immobile micronutrient, the trouble always starts from the top-down. If it strikes during the bloom cycle, flowers will not form densely.
CAUSES OF COPPER DEFICIENCY
Overwatering and/or imbalanced pH are the two known causes of this uncommon deficiency. Copper is needed in trace amounts, but is an essential element nonetheless. Without copper, cannabis plants cannot synthesise plastocyanin, which is a blue-coloured protein required for photosynthesis. Lockout can occur with a fluctuating pH level, while excessive watering leaches the medium of trace elements.
CURES FOR COPPER DEFICIENCY
Finally, we get to lay a quick fix on you. Simply dial in your pH levels to the optimal ranges for your chosen growing medium (Soil: 6.0-7.0pH, Coco and Hydro: 5.5-6.5pH). Water plants only as required. Maintain an effective wet-dry cycle. There is absolutely no need to specifically supplement cannabis plants with copper. We are not sure such a product even exists. Affected leaves will need to be removed, as they will not recover.
Symptoms of Deficiency
If your plant is not taking in enough phosphorus, its growth will slow down, and it will generally appear frailer and lacking life. The initial symptoms of a phosphorus deficiency are darkening foliage and slowing growth. The leaves’ edges on your cannabis plant will lose their vibrant green color – they may even turn brown – and will start to curl in. Other plant parts like petioles will also darken, possibly becoming more blue or red., but it also adds structural strength to the roots and stems of the plant.
These symptoms are more likely to appear during the coldest days of the growing season since this is the time when marijuana plants often have the most difficult time absorbing phosphorus from the soil. In addition to the cold, if the soil is too wet or too alkaline, the same problems will occur.
Deficiency and excess of Nitrogen in cannabis plants
Nitrogen (N) (mobile element): Essential during vegetative growth, nitrogen plays a central role in the formation of leaves and stems, in chlorophyll production and in photosynthesis.
Nitrogen deficiency: Older leaves near the base of the plant gradually yellow and overall plant development is delayed. Because it is a mobile element, nitrogen stored in older leaves can be used to solve a deficiency elsewhere in the plant. You can easily solve a nitrogen deficiency, bringing colour and vigour back to your plants, by watering with a nitrogen-rich, pH-balanced solution.
Nitrogen excess: Leaves turn glossy dark green, starting at the margins and spreading out until the whole leaf surface is covered. Tips curl down like eagle claws. To turn nitrogen excess around and get your plants thriving again, flush the substrate in a bathtub for about 15-20 minutes, leave it to dry and add enzymes with the next watering.
Deficiency and excess of magnesium in cannabis plants
Magnesium as mineral
Magnesium is a very necessary secondary nutrient in all the stages of the plants life, and it’s needed in large quantities. It’s the central atom of chlorophyll and has a direct impact on the absorption of solar energy to be subsequently processed and used by the plant in the creation of sugars and carbohydrates.
The cannabis plant absorbs magnesium in ion Mg+2 form, being this the magnesium formulation normally found in most soils. Thus, the absorption of this nutrient will be determined by the available form of this element in the substrate for marijuana plants.
It’s important to find a balance between the available and the unavailable magnesium in the soil. Unavailable magnesium still hasn’t been transformed by the microbial life yet, so plants can’t absorb it. It’s important to know the amount of magnesium available for the plant (which is very difficult to know without analyzing the substrate).
Then, how should we proceed when growing in soil/hydro to have the magnesium levels in the substrate under control? As it’s a mineral, we can supply our plants with it by using a mono-nutrient in Mg + 2 form or other products high in Mg, so we achieve a direct uptake by the roots without having to wait for the microbial life to transform it into assimilable elements for the plant.
Magnesium (Mg) deficiency in cannabis plants
Beginning of Magnesium deficiency
If the Ph range of the substrate is lower than 7.0, then magnesium can be easily absorbed by cannabis plants. But if the soil is very acid – lower than 5.0 – magnesium won’t be assimilable by the plants. In this case, we should increase the Ph level of the substrate by using limestone dolomite. There are other products on the market that contain magnesium in case of not having limestone dolomite to mix with the substrate.
As magnesium is a mobile element, any deficiency of this nutrient will be first visible in the oldest leaves and those of the lower part of the plant. As the deficiency advances, the central part will also be affected.
Magnesium – as nitrogen – is easily flushed through abundant watering. If we wash the roots to solve other other nutrient excesses (N, P, K) we must add magnesium and calcium to maintain a correct nutrient balance. Normally, growers use two parts of Ca for one of Mg (EC=0.4).
Deficiency and excess of MOLYBDENUM in cannabis plants
WHAT IS MOLYBDENUM DEFICIENCY?
Similar to the rest of the essential trace minerals, molybdenum is only required in minute quantities. Molybdenum helps marijuana to metabolise nitrogen. Without it, cannabis plants simply cannot grow strong and healthy.
SYMPTOMS OF MOLYBDENUM DEFICIENCY
Sudden, strange leaf discolouration midway up the plant is the beginning of a molybdenum deficiency. Leaves will turn yellow and/or almost pale white and begin to curl inwards. Rapidly, newer growth will yellow and discolour. If left untreated, leaves will eventually turn a scorched, rusty shade.
CAUSES OF MOLYBDENUM DEFICIENCY
Again, nutrient lockout is the scourge of the cannabis grower. Outside of the 6.0-6.5pH range, roots will not be able to absorb molybdenum, even if it is present in abundance. This particular trace element deficiency is very rare, but usually leads to disaster. Molybdenum deficiency is often misdiagnosed when it does happen to strike. Unlike manganese, this trace mineral is highly mobile and the deficiency can spread throughout the whole plant in no time.
CURES FOR MOLYBDENUM DEFICIENCY
Keeping pH levels of nutrient solution dialled in and using tap water should help you to avoid this deficiency. However, mistaking molybdenum deficiency for a nitrogen deficiency is one of the most frequent grower errors. Furthermore, it has also been linked to phosphorus deficiencies. Tight control of pH levels and using cannabis-specific nutrients are the only preventative solutions. Necrotic foliage will have to be pruned and growth will be stunted. How significantly depends on how fast you react. Molybdenum deficiency is messy to correct.
Deficiency and excess of Boron in cannabis plants
One of the rarer deficiencies is boron. It’s not common for cannabis cultivation, but it can certainly damage the plant’s potential growth. The most visible signs of boron deficiency are when the growing tips of the plant begin to turn brown or gray.
The growth itself will slow significantly or stop if there isn’t enough boron. In addition to the damage experienced by the growing tips, the leaves may start to develop dead spots. They will be small and scattered and might go easily unnoticed.
Make sure you take counteractive measures to fix boron deficiencies right away. Fixing the problem usually starts with adjusting irrigation processes and making sure you’re getting the boron back into the environment. Boric acid is a simple and common choice for growers, but compost and natural mixes are also potential options to bring the levels back to normal. Read more about boron deficiencies in marijuana plants.
Sulphur (S) (immobile element)
Essential to chlorophyll production and to the organoleptic profile of flowers, sulphur plays a central role in the formation of the plant's structural organs, playing a part also in the production and regulation of hormones and vitamins.
Signs of Sulphur Deficiency: Plant growth is delayed and leaves develop chlorosis. Petioles turn purple and stems become brittle. Smaller leaves can distort and curl up slightly before wilting and dropping. During flowering, some buds become necrotic. You can solve this deficiency by using Epsom salt or a sulphur-rich fertilizer.
Signs of Sulphur Excess: Plant growth is drastically delayed, with leaves taking on a dark green hue and leaf tips wilting and drying out. Sulphur toxicity is rarely seen in cannabis, as the element is generally well managed by plants without any need for intervention.
Zinc deficiency and excess in marijuana plants
Zinc is a necessary element for cannabis plants because it directly interacts in the creation of the chlorophyll. It?s immediately related to the creation of auxins and growth hormones. It must be noticed that the zinc intake depends on the PH level of the substrate and the concentration of other nutrients. For example, a phosphorus excess affects the intake of zinc.
It?s absorbed by the plants in form of bivalent ion (Zn2+ ), being also easily absorbed from the epidermis and the branches. In soils with a very acid PH level, the roots can?t absorb Zinc and transfer it to the above-ground part of the plant, just as happens with substrates exposed to low temperatures and a constant humidity caused byZinc (Zn) (mobile): Plays a major role in chlorophyll production and is essential for ensuring healthy plant tissues.
Zinc deficiency: Plant growth is delayed and young leaves show interveinal chlorosis. New shoots become stunted and shrivel, while leaf tips discolour and burn. During flowering, buds become distorted and brittle, eventually drying out. The solution is the same as for iron deficiency.
Zinc excess: Zinc excess is quite hard to treat, as in most cases the plant dies almost instantly from an iron deficiency caused by the excess levels of zinc.
Manganese plays a major role in photosynthesis and aids in the formation of chloroplast membranes (cellular development of the plant).
Signs of Manganese Deficiency: Young leaves show interveinal chlorosis followed by necrotic spots, which gradually spread to older leaves. General plant growth slows down or stops altogether. The solution is the same as for iron and zinc deficiency.
Signs of Manganese Excess: Young leaves develop a type of chlorosis characterized by dark orange to rust-brown mottling, which gradually spreads to older leaves, significantly affecting plant vigour. This causes the plant to transpire more than necessary, eventually leading to iron and zinc deficiency.
conclusion
If growing cannabis indoors, you can better control the climatic conditions of cannabis cultivation, which can reduce the symptoms of cannabis nutrition deficiency.An indoor cannabis grow is a great way to provide yourself with a safe and sufficient supply of medicinal-grade cannabis. Even more, if you like gardening, it’s both an exciting and enjoyable experience to grow cannabis.If you want growing cannabis indoor ,we suggest you to choose a indoor grow kit, a complete indoor grow kit will include cannabis grow tents, cannabis grow lights, inline fans for cannabis, carbon filters and some other necessary tool you will need. It can save your time for choosing growing equipments and it is really cheaper than buying separately, the most important thing is the grow package is professional for a beginner.
Deficiencies are not the only possible problems your plants could have with nutrients. They could also have too much of something, including the three essential nutrients (Nitrogen, Phosphorus, and Potassium, or N-P-K). So how can you identify it?
First, reflect on whether what you have been feeding your plant has been entirely balanced, specifically with regards to N-P-K. After that, test the pH value of the soil and water that you’ve already been giving them. The nutrients deficiencies can be caused by many things, but the most significant factor is pH value. If the pH levels aren’t perfect, fix them. If they are balanced and your plants are exhibiting symptoms of being unhealthy, then it is possible that the issue is connected to the sunlight, as this is not easily controlled by you.
Before you get too confused or overwhelmed by the possibilities, make sure you are identifying it correctly. If your plants are receiving plenty of sunlight and balanced water, the chances are good that the problem lies with the nutrients.
Deficiency and excess of Iron in cannabis plants
Iron isn’t a mobile element and although it isn’t part of the chlorophyll, it does contribute to both the pigmentation and leaf respiration of marijuana plants. Furthermore, it also interacts directly in the enzyme production process. The plant can absorb it in the form of ferric ion (Fe++) although it can also be absorbed organically.
In most crops, deficiencies of this element are usually preceded by a PH value higher than 7.0 in the substrate, in which the plant can’t absorb Iron through its roots. Nor will it be absorbed in very alkaline or chalky soils.
There are other reasons why the plant won’t perform a correct Iron uptake even if it’s present in the substrate: high levels of carbonates, high salinity, constant humidity, low temperatures or excess of other micro-elements that may cause nutrient lockout.
In this case, the youngest leaves – those of the upper part of the plant – will show ferric chlorosis, keeping their veins green. If this symptom isn’t treated, the leaves will become discoloured, with green veins.
Advance of Iron deficiency
Plants use different and varied ways to absorb the Iron contained in the substrate. Through chelating mechanisms – based on the creation of Siderophores that act sinergically with different bacteria – Iron becomes much more profitable for cannabis plants.
Copper deficiency is a rare mineral deficiency that can be easily corrected. That’s provided you detect it and react fast. Copper deficiency is so uncommon that many growers have no idea what is blighting their cannabis plants.
SYMPTOMS OF COPPER DEFICIENCY
In the beginning, top leaves will look overfertilised with yellow fringes. Rapidly, green tops will turn an odd metallic bluish tone or may look bleached. Not the typical chlorosis associated with other nutrient deficiencies. As an immobile micronutrient, the trouble always starts from the top-down. If it strikes during the bloom cycle, flowers will not form densely.
CAUSES OF COPPER DEFICIENCY
Overwatering and/or imbalanced pH are the two known causes of this uncommon deficiency. Copper is needed in trace amounts, but is an essential element nonetheless. Without copper, cannabis plants cannot synthesise plastocyanin, which is a blue-coloured protein required for photosynthesis. Lockout can occur with a fluctuating pH level, while excessive watering leaches the medium of trace elements.
CURES FOR COPPER DEFICIENCY
Finally, we get to lay a quick fix on you. Simply dial in your pH levels to the optimal ranges for your chosen growing medium (Soil: 6.0-7.0pH, Coco and Hydro: 5.5-6.5pH). Water plants only as required. Maintain an effective wet-dry cycle. There is absolutely no need to specifically supplement cannabis plants with copper. We are not sure such a product even exists. Affected leaves will need to be removed, as they will not recover.
Deficiency and excess of Phosphorus in Cannabis plants
While not as common as nitrogen deficiencies, phosphorus deficiencies are a definite possibility, especially in hydroponics systems. Phosphorus is primarily responsible for helping your plant grow roots, as well as increasing the strength of its leaves and stems. It also aids in seedling germination, making it an especially essential nutrient during your plant’s flowering phase. In fact, many would say that phosphorus is actually most important during the flowering phase of growth. If your plant lacks phosphorus during the flowering phase, you will limit the potential yield. Don’t be dainty when providing your plant with phosphorus; it is usually necessary in hefty quantities.
Symptoms of Deficiency
If your plant is not taking in enough phosphorus, its growth will slow down, and it will generally appear frailer and lacking life. The initial symptoms of a phosphorus deficiency are darkening foliage and slowing growth. The leaves’ edges on your cannabis plant will lose their vibrant green color – they may even turn brown – and will start to curl in. Other plant parts like petioles will also darken, possibly becoming more blue or red., but it also adds structural strength to the roots and stems of the plant.
These symptoms are more likely to appear during the coldest days of the growing season since this is the time when marijuana plants often have the most difficult time absorbing phosphorus from the soil. In addition to the cold, if the soil is too wet or too alkaline, the same problems will occur.
Deficiency and excess of Nitrogen in cannabis plants
Nitrogen (N) (mobile element): Essential during vegetative growth, nitrogen plays a central role in the formation of leaves and stems, in chlorophyll production and in photosynthesis.
Nitrogen deficiency: Older leaves near the base of the plant gradually yellow and overall plant development is delayed. Because it is a mobile element, nitrogen stored in older leaves can be used to solve a deficiency elsewhere in the plant. You can easily solve a nitrogen deficiency, bringing colour and vigour back to your plants, by watering with a nitrogen-rich, pH-balanced solution.
Nitrogen excess: Leaves turn glossy dark green, starting at the margins and spreading out until the whole leaf surface is covered. Tips curl down like eagle claws. To turn nitrogen excess around and get your plants thriving again, flush the substrate in a bathtub for about 15-20 minutes, leave it to dry and add enzymes with the next watering.
Deficiency and excess of magnesium in cannabis plants
Magnesium as mineral
Magnesium is a very necessary secondary nutrient in all the stages of the plants life, and it’s needed in large quantities. It’s the central atom of chlorophyll and has a direct impact on the absorption of solar energy to be subsequently processed and used by the plant in the creation of sugars and carbohydrates.
The cannabis plant absorbs magnesium in ion Mg+2 form, being this the magnesium formulation normally found in most soils. Thus, the absorption of this nutrient will be determined by the available form of this element in the substrate for marijuana plants.
It’s important to find a balance between the available and the unavailable magnesium in the soil. Unavailable magnesium still hasn’t been transformed by the microbial life yet, so plants can’t absorb it. It’s important to know the amount of magnesium available for the plant (which is very difficult to know without analyzing the substrate).
Then, how should we proceed when growing in soil/hydro to have the magnesium levels in the substrate under control? As it’s a mineral, we can supply our plants with it by using a mono-nutrient in Mg + 2 form or other products high in Mg, so we achieve a direct uptake by the roots without having to wait for the microbial life to transform it into assimilable elements for the plant.
Magnesium (Mg) deficiency in cannabis plants
Beginning of Magnesium deficiency
If the Ph range of the substrate is lower than 7.0, then magnesium can be easily absorbed by cannabis plants. But if the soil is very acid – lower than 5.0 – magnesium won’t be assimilable by the plants. In this case, we should increase the Ph level of the substrate by using limestone dolomite. There are other products on the market that contain magnesium in case of not having limestone dolomite to mix with the substrate.
As magnesium is a mobile element, any deficiency of this nutrient will be first visible in the oldest leaves and those of the lower part of the plant. As the deficiency advances, the central part will also be affected.
Magnesium – as nitrogen – is easily flushed through abundant watering. If we wash the roots to solve other other nutrient excesses (N, P, K) we must add magnesium and calcium to maintain a correct nutrient balance. Normally, growers use two parts of Ca for one of Mg (EC=0.4).
Deficiency and excess of MOLYBDENUM in cannabis plants
WHAT IS MOLYBDENUM DEFICIENCY?
Similar to the rest of the essential trace minerals, molybdenum is only required in minute quantities. Molybdenum helps marijuana to metabolise nitrogen. Without it, cannabis plants simply cannot grow strong and healthy.
SYMPTOMS OF MOLYBDENUM DEFICIENCY
Sudden, strange leaf discolouration midway up the plant is the beginning of a molybdenum deficiency. Leaves will turn yellow and/or almost pale white and begin to curl inwards. Rapidly, newer growth will yellow and discolour. If left untreated, leaves will eventually turn a scorched, rusty shade.
CAUSES OF MOLYBDENUM DEFICIENCY
Again, nutrient lockout is the scourge of the cannabis grower. Outside of the 6.0-6.5pH range, roots will not be able to absorb molybdenum, even if it is present in abundance. This particular trace element deficiency is very rare, but usually leads to disaster. Molybdenum deficiency is often misdiagnosed when it does happen to strike. Unlike manganese, this trace mineral is highly mobile and the deficiency can spread throughout the whole plant in no time.
CURES FOR MOLYBDENUM DEFICIENCY
Keeping pH levels of nutrient solution dialled in and using tap water should help you to avoid this deficiency. However, mistaking molybdenum deficiency for a nitrogen deficiency is one of the most frequent grower errors. Furthermore, it has also been linked to phosphorus deficiencies. Tight control of pH levels and using cannabis-specific nutrients are the only preventative solutions. Necrotic foliage will have to be pruned and growth will be stunted. How significantly depends on how fast you react. Molybdenum deficiency is messy to correct.
One of the rarer deficiencies is boron. It’s not common for cannabis cultivation, but it can certainly damage the plant’s potential growth. The most visible signs of boron deficiency are when the growing tips of the plant begin to turn brown or gray.
The growth itself will slow significantly or stop if there isn’t enough boron. In addition to the damage experienced by the growing tips, the leaves may start to develop dead spots. They will be small and scattered and might go easily unnoticed.
Make sure you take counteractive measures to fix boron deficiencies right away. Fixing the problem usually starts with adjusting irrigation processes and making sure you’re getting the boron back into the environment. Boric acid is a simple and common choice for growers, but compost and natural mixes are also potential options to bring the levels back to normal. Read more about boron deficiencies in marijuana plants.
Deficiency and excess of Sulphur in cannabis plants
Sulphur (S) (immobile element)
Essential to chlorophyll production and to the organoleptic profile of flowers, sulphur plays a central role in the formation of the plant's structural organs, playing a part also in the production and regulation of hormones and vitamins.
Signs of Sulphur Deficiency: Plant growth is delayed and leaves develop chlorosis. Petioles turn purple and stems become brittle. Smaller leaves can distort and curl up slightly before wilting and dropping. During flowering, some buds become necrotic. You can solve this deficiency by using Epsom salt or a sulphur-rich fertilizer.
Signs of Sulphur Excess: Plant growth is drastically delayed, with leaves taking on a dark green hue and leaf tips wilting and drying out. Sulphur toxicity is rarely seen in cannabis, as the element is generally well managed by plants without any need for intervention.
Zinc deficiency and excess in marijuana plants
Zinc is a necessary element for cannabis plants because it directly interacts in the creation of the chlorophyll. It?s immediately related to the creation of auxins and growth hormones. It must be noticed that the zinc intake depends on the PH level of the substrate and the concentration of other nutrients. For example, a phosphorus excess affects the intake of zinc.
It?s absorbed by the plants in form of bivalent ion (Zn2+ ), being also easily absorbed from the epidermis and the branches. In soils with a very acid PH level, the roots can?t absorb Zinc and transfer it to the above-ground part of the plant, just as happens with substrates exposed to low temperatures and a constant humidity caused byZinc (Zn) (mobile): Plays a major role in chlorophyll production and is essential for ensuring healthy plant tissues.
Zinc deficiency: Plant growth is delayed and young leaves show interveinal chlorosis. New shoots become stunted and shrivel, while leaf tips discolour and burn. During flowering, buds become distorted and brittle, eventually drying out. The solution is the same as for iron deficiency.
Zinc excess: Zinc excess is quite hard to treat, as in most cases the plant dies almost instantly from an iron deficiency caused by the excess levels of zinc.
Deficiency and excess of Calcium in cannabis plants
Calcium is a secondary element essential to cell wall and tissue formation and strengthening. It plays a part in root development and contributes to nutritional balance with its buffering effect, giving the plant some control over certain nutritional excesses.
Signs of Calcium Deficiency: Growth is delayed, notably at the roots, and the plant becomes less vigorous. Leaves distort, developing irregular margins and curling tips. This also affects young leaves, which show discoloration and wither rapidly. During flowering, flower production slows down until it stops altogether. You can easily tackle calcium deficiency with a calcium-rich fertilizer.
Signs of Calcium Excess: Excess calcium can block the absorption of other elements such as potassium, magnesium, manganese and iron. The best solution here is to clean the roots thoroughly and to feed small amounts of a fertilizer containing all the micro and macronutrients necessary for proper plant development.
Calcium is a secondary element essential to cell wall and tissue formation and strengthening. It plays a part in root development and contributes to nutritional balance with its buffering effect, giving the plant some control over certain nutritional excesses.
Signs of Calcium Deficiency: Growth is delayed, notably at the roots, and the plant becomes less vigorous. Leaves distort, developing irregular margins and curling tips. This also affects young leaves, which show discoloration and wither rapidly. During flowering, flower production slows down until it stops altogether. You can easily tackle calcium deficiency with a calcium-rich fertilizer.
Signs of Calcium Excess: Excess calcium can block the absorption of other elements such as potassium, magnesium, manganese and iron. The best solution here is to clean the roots thoroughly and to feed small amounts of a fertilizer containing all the micro and macronutrients necessary for proper plant development.
Deficiency and excess of Manganese in cannabis plants
Manganese plays a major role in photosynthesis and aids in the formation of chloroplast membranes (cellular development of the plant).
Signs of Manganese Deficiency: Young leaves show interveinal chlorosis followed by necrotic spots, which gradually spread to older leaves. General plant growth slows down or stops altogether. The solution is the same as for iron and zinc deficiency.
Signs of Manganese Excess: Young leaves develop a type of chlorosis characterized by dark orange to rust-brown mottling, which gradually spreads to older leaves, significantly affecting plant vigour. This causes the plant to transpire more than necessary, eventually leading to iron and zinc deficiency.
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