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Cannabis Deficiency Symptoms: Diagnosing and Treating Nutrient Problems

When it comes to cannabis plants, providing them with the proper nutrients is absolutely essential, or else you will end up with cannabis nutrient deficiencies. Cannabis nutrient deficiencies for cannabis plants can be downright deadly. If your plants are experiencing a cannabis nutrient deficiency, it means that they won’t be able to grow properly.

Everything from their cell wall structure and leaf growth to the formation of flowers is greatly affected by a variety of nutrient deficiencies. If you’re dealing with cannabis deficiencies, you’ll need to find a way to treat those nutrients deficiencies. Or else you’ll run into some very serious problems, with stunted growth being just one of them.

What we’re here to do today is to take a look at all of the most common cannabis nutrient deficiencies, why cannabis nutrient deficiencies occur, how to identify cannabis nutrient deficiencies, and how to treat them. Let’s get right to it and take a look at everything you need to know about deficiencies in cannabis plants.

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Primary Cannabis Nutrients & Cannabis Plant Deficiencies

The most important types of nutrients that we need to discuss as far as cannabis deficiencies are concerned are the big three, otherwise known as the NPK nutrients, nitrogen, potassium, and phosphorus. All of these nutrients are essential to the health of cannabis plants, with nitrogen being essential for the vegetative stage of growth, and potassium and phosphorus both being essential for the flowering stages, and more. Let’s take a quick look.

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Nitrogen

One of the most important nutrients required for cannabis plants is nitrogen. When it comes to vegetative growth, this is likely the most important nutrient of all. Nitrogen is essential for developing a strong overall plant structure, as well As for leaf development.

Leaves are of course important for performing photosynthesis, which in turn leads to plant growth. Nitrogen is also a crucial component of amino acids, proteins, and chlorophyll, all of which are essential for the healthy growth of your cannabis plant, especially as far as photosynthesis is concerned.

Signs of a Nitrogen Deficiency

If you notice that your cannabis plant seems to be suffering from stunted growth, that the bottom and the oldest of leaves are starting to turn yellow, and that the leaves are remaining very small instead of growing big, then it is most likely that your cannabis plant is suffering from a nitrogen deficiency

How to Provide Weed Plants with More Nitrogen

To provide your replants with more nitrogen, provide them with a nitrogen rich fertilizer that has a high nitrogen percentage, as this is essential for vegetative growth. This could take the form of either synthetic or organic nutrients.

Phosphorus

Next, we have phosphorus, which is extremely important for the flowering stage of cannabis growth. First and foremost, phosphorus is required for the transfer and storage of energy inside of the marijuana plant. Phosphorus also plays a number of other key roles in the cannabis plant, such As for photosynthesis, cell division, and for the formation of both DNA and RNA. Without enough fathers, your cannabis plant won’t grow nice and bake flowers.

Signs of a Phosphorus Deficiency

If your cannabis plant is in the flowering stage, and you notice that the buds are very small, that the stems and leaves are purple or reddish, and that the plant is just not flowering properly overall, then chances are pretty big that your cannabis plant is suffering from a phosphorus deficiency.

How to Provide Weed Plants with More Phosphorus

To support proper bud and flower growth, provide your cannabis plants with a phosphorus rich fertilizer that has a high phosphorus content.

Potassium

Next on the list is potassium, which is also very important during the flowering stage, but also plays roles during the vegetative stage of cannabis growth. Potassium is very important for increasing cell wall health, for resisting stress, and for improving disease resistance. Potassium is also crucial for a variety of metabolic processes of the cannabis plant, which include the synthesis of carbohydrates and protein, nutrient uptake, and water regulation.

Signs of a Potassium Deficiency

If you see that your cannabis plant has weak stems, brown leaf edges, that the leaves are curling, and other related symptoms, and chances are almost 100% that your marijuana plant is suffering from a potassium deficiency.

How to Provide Weed Plants with More Potassium

Just like with the other two primary nutrients, the number one best way to provide your cannabis plants with more potassium is by using a potassium rich fertilizer, which is great they’re both flowering and the vegetative stage.

Secondary Cannabis Nutrients and Nutrient Deficiencies

Now that we know what cannabis deficiencies in terms of the primary nutrients look like, let’s take a closer look at the secondary nutrients.

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Calcium

Your marijuana plant requires calcium to provide it with a stable well structure, and to allow it to grow strong generally. Calcium is also a crucial mineral for cannabis plants so they can better uptake of variety of other nutrients.

Signs of a Calcium Deficiency

Signs of a calcium deficiency in weed plants include having necrotic spots on the new growth, combined with distorted or curled leaves. You may also notice blossom end rot, especially in cannabis plants that are flowering. You may also notice weak branches and stems, along with potential branch breakage, combined with reduced overall plant growth.

How to Provide Weed Plants with More Calcium

To provide your cannabis plants with more calcium, you can give them some bone meal, some calcium supplements, gypsum, calcium nitrate, or agricultural lime.

Magnesium

Second on the list is magnesium, and this is a crucial component of chlorophyll, which means that it is an essential mineral that is required for cannabis plants to engage in photosynthesis. Photosynthesis is how cannabis plants convert fuel into energy for growth. Magnesium is also very important for enzyme activation and nutrient uptake.

Signs of a Magnesium Deficiency

Magnesium deficiency in cannabis plants takes the form of interveinal chlorosis, which is when veins remain green but the leaves turn yellow in between the veins. You might also notice that the tips and margins of the leaves turn purple or reddish, that the leaves begin twisting, curling, or cupping, and that the leaves are quite brittle and generous. You will also notice stunted plant growth.

How to Provide Weed Plants with More Magnesium

To provide your cannabis plants with more magnesium, cannabis nutrients are recommended, although using Epsom salt and water as a foliar spray and root drench is also a great method.

Sulfur

Third, we have sulfur, which is yet another crucial component of a variety of amino acids, proteins, and vitamins within the cannabis plant. The marijuana plant requires all of these to grow strong leaves and flowers alike. On that note, sulfur is crucial for the formation of chlorophyll, which leads to overall plant growth.

Signs of a Sulfur Deficiency

If your cannabis plant has a sulfur deficiency, you’ll notice that the young leaves turn yellow, that the leaves are small and narrow, and often cuffed and twisted. You’ll also notice that new leads are very slow to develop, and that plant growth is very slow overall.

How to Provide Weed Plants with More Sulfur

To provide your cannabis plants with more sulfur, you can always add some elemental sulfur into the growing medium or soil, or you can also use a variety of sulfate-based fertilizers.

Iron

Iron is yet another very important element required for cannabis plant growth. Most important of all, it is a component of chlorophyll, which your marijuana plant needs to perform photosynthesis. Iron is also important for enzyme activation common nitrogen fixation, and it is also involved in electron transfer during photosynthesis. It is therefore crucial for both the flowering stage and vegetative stage of cannabis growth.

Signs of a Iron Deficiency

If your cannabis plant has an iron deficiency, you’ll also notice interval chlorosis, along with yellow or pale new leaves, weak stems, reduced growth, and general poor plant health.

How to Provide Weed Plants with More Iron

Although you can of course buy a variety of cannabis nutrients, one of the best ways to provide your cannabis plants with more iron is to apply a variety of chelated iron products as a soil drench or foliar spray.

Manganese

Next on the list is manganese, which is yet another important element for photosynthesis and enzyme activation in marijuana plants. It also helps you breakdown water during the photosynthetic process, plus it helps to form amino acids, chlorophyll, and proteins.

Signs of a Manganese Deficiency

If your cannabis plant is suffering from a manganese deficiency, you’ll also notice interveinal chlorosis which primarily affects older leaves. You may also notice that the leaf veins turn purple or red, that the leaves twist or curl, and that the plant just doesn’t perform photosynthesis while anymore, resulting in stunted growth.

How to Provide Weed Plants with More Manganese

The best way to provide your cannabis plants with more manganese is to use manganese sulfate as a foliar spray or soil drench.

Zinc

Zinc is the next important element that is required for cannabis plant growth, because it helps to form auxins, which is a type of hormone that benefits the cannabis plant. Zinc is also involved in enzyme activation, DNA synthesis, and it is also extremely important for overall growth and healthy root development.

Signs of a Zinc Deficiency

If your marijuana plant is suffering from async deficiency, you’ll notice that the plant is very small, especially the leaves. You’ll also notice that the young leaves are most likely suffering from interveinal chlorosis, that the leaves are growing irregularly or distorted, and that if your plant is flowering, that the buds won’t develop properly.

How to Provide Weed Plants with More Zinc

Although both many synthetic and organic nutrients for cannabis contain zinc, one of the easiest ways to increase the amount of zinc your marijuana plants get is to use zinc sulfate as a foliar spray or a soil drench.

Copper

Next on the list we have copper, which is very important because cannabis plants require it for various enzymatic systems that are involved in metabolism, photosynthesis, and plant respiration. Copper is also very important for the formation of lignin, and is therefore very important for cannabis plant growth.

Signs of a Copper Deficiency

Signs of a copper deficiency in cannabis plants include core plant vigor, reduced growth, and the wilting of leaves, combined with twisting and distortion, and possibly necrotic spots. You will also notice that younger leaves are yellowish or pale green, and that leaves may start dropping off of the plant.

How to Provide Weed Plants with More Copper

To provide your plants with more copper, either cannabis nutrients or a a full year spray of copper sulfate is recommended.

Boron

Boron is the next element that your marijuana plant needs to grow properly, and it is associated with many different growth processes. This includes cell wall formation, pollen tube growth, and the metabolism of carbohydrates. Boron is also needed by marijuana plants to allow them to absorb increased amounts of calcium, which as you can tell from above, is also very important.

Signs of a Boron Deficiency

Signs of a boron deficiency in cannabis plants include brittle and distorted leaves, having poor flower development, the Browning or yellowing of leaf tips, and drastically reduced bud and flower formation.

How to Provide Weed Plants with More Boron

To provide your marijuana plants with more boron, you will need to use specialized cannabis supplements that contain it. Otherwise providing your cannabis plants with boron is quite difficult.

Molybdenum

Molybdenum is another element that all cannabis plants need, particularly for the metabolism of nitrogen. As you can tell from above, nitrogen is very important for cannabis plants, but without Kamala denim, they can’t process it properly.

Signs of a Molybdenum Deficiency

Signs of a molybdenum deficiency in cannabis plants include the yellowing of older leaves, stunted plant growth, and deficiency symptoms related to nitrogen deficiencies. Remember, molybdenum is required for nitrogen absorption, and without good molybdenum levels, your plant also won’t be getting enough nitrogen.

How to Provide Weed Plants with More Molybdenum

The same is the case for mall of denim As for boron, and to provide your cannabis plants with it, you’ll need a dedicated product.

Chlorine

Last but not least, we have chlorine, which cannabis plants require to perform photosynthesis, as well As for water splitting. It also helps maintain proper osmotic pressure.

Signs of a Chlorine Deficiency

If your plant isn’t getting enough chlorine, it may lead to leaf tip burn, wilting, and poor plant health in general.

How to Provide Weed Plants with More Chlorine

you usually won’t need to provide your cannabis plants with more chlorine, because your tap water should have more than enough of it.

The Dangers of Cannabis Nutrient Deficiencies

The simple reality here is that if your cannabis plants don’t get enough nutrients, they’ll start suffering from nutrient deficiencies. If it comes to the vegetative stage, this could lead to stunted growth, a lack of photosynthesis, a lack of foliage growth, weak stems, weak leaves, and distorted leaves.

If we are talking about cannabis deficiencies during the flowering stage, this can lead to weak plant growth overall, low and slow bud growth, unhealthy flowers, and limited potency and aroma.

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Taking Care of Cannabis Plants and Their Nutrient Needs

As you can see, the bottom line here is that being able to identify a variety of cannabis nutrient deficiencies as quickly as possible is crucial to the overall health and survival of your marijuana plants. The faster you can identify and diagnose a specific cannabis deficiency, the faster you can get to healing your plant and taking care of the problem.

Fabian Raemy is an avid cannabis enthusiast and expert. He's been a part of the cannabis community in one way or another for the past 15 years. Whether cultivating or consuming, Fabian knows his cannabis inside out. In his humble opinion, there’s just nothing more rewarding than growing a great strain of marijuana and being able to take a puff of some home grown green.

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