What Nutrients Do Cannabis Plants Need?

Learn about the different nutrients cannabis plants need in order to thrive. This information will help you create a healthy environment for your plants, and ultimately produce better results.

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Cannabis Nutrients

In order for cannabis plants to thrive, they need a few key nutrients. These include nitrogen, phosphorus, and potassium . These are often referred to as NPK. In addition to NPK, cannabis plants also need other minerals like magnesium, calcium, and sulfur. If your plants are not getting enough of these nutrients, they will not be able to grow properly.

Nitrogen (N)

Nitrogen is one of the three primary macronutrients that cannabis plants need in order to grow (the others being phosphorus and potassium). It’s also one of the most important, as nitrogen plays a role in just about every aspect of plant growth, from photosynthesis to cell division.

A lack of nitrogen can cause plants to become stunted and yellow, and can prevent them from reaching their full potential. On the other hand, too much nitrogen can lead to ‘burn’ where leaves become crispy and brown. For this reason, it’s important to get the Nitrogen levels in your grow medium just right.

Cannabis plants typically need more nitrogen during the vegetative stage of growth, when they are actively growing new leaves and stems. During the flowering stage, they will require less nitrogen and more phosphorus.

Phosphorus (P)

Phosphorus is a macronutrient that is crucial to the growth and development of all plants, including cannabis. It is involved in almost every metabolic process and helps plants to better use water and produce larger, healthier flowers. Although cannabis plants can get some phosphorus from the air, they will need to be supplemented with additional phosphorus if they are to grow and thrive.

The best way to give your cannabis plants the phosphorus they need is through a quality fertilizer that contains phosphorus. However, it is important to make sure that you do not over-fertilize your plants, as this can lead to problems such as nutrient burn. If you are unsure of how much phosphorus your plants need, it is always best to start with a lower amount and then increase it gradually as needed.

In general, cannabis plants will need more phosphorus during the vegetative stage of growth than they do during the flowering stage. However, this will vary depending on the specific strain of plant you are growing. Some strains may require more phosphorus than others, so it is always best to consult with a knowledgeable grower or breeder before giving your plants any type of fertilizer.

Potassium (K)

Potassium is a macronutrient needed by cannabis plants in large quantities. It is involved in many important processes, such as photosynthesis, water uptake, and the movement of nutrients within the plant. A potassium deficiency will cause leaves to yellow and curl up at the edges. Cannabis plants need extra potassium during the flowering stage to produce large, potent buds.


Cannabis plants need three primary macronutrients: nitrogen (N), phosphorus (P), and potassium (K). These are typically found in fertilizers and are necessary for the plant to grow. Nitrogen is responsible for the plant’s leaves, phosphorus is responsible for the plant’s roots, and potassium is responsible for the plant’s flowers.

Calcium (Ca)

Cannabis plants need calcium for proper cell function and development. It is especially important during the early stages of growth, when plants are rapidly producing new leaves and stems. A lack of calcium can cause problems with root development and lead to stunted growth.

Calcium is a macronutrient, which means that it is needed in relatively large amounts to support plant growth. It is typically available in commercial fertilizers as calcium nitrate or calcium sulfate.

Magnesium (Mg)

Magnesium is one of the most important macronutrients for cannabis plants, and it plays a vital role in several key plant processes. For example, magnesium is essential for photosynthesis, the process by which plants convert sunlight into energy. It’s also involved in the creation of chlorophyll, the green pigment that helps plants absorb light. In addition, magnesium helps to regulate a plant’s uptake of other important nutrients, such as nitrogen and phosphorus.

Magnesium deficiencies are relatively common in cannabis plants, especially in outdoor gardens where soil quality may be poor. Symptoms of a magnesium deficiency include yellowing leaves (particularly between the veins), stunted growth, and leaf necrosis (death). If you suspect your plant has a magnesium deficiency, you can try fertilizing with a product that contains magnesium sulfate or Epsom salt.

Sulfur (S)

Sulfur is a macronutrient that is essential for the growth and development of cannabis plants. It is involved in the formation of chlorophyll, proteins, enzymes, and helps to build strong cell walls. Sulfur is usually available in the soil, but it can be depleted by heavy rains or irrigation. If your plants are showing signs of sulfur deficiency (yellowing leaves with green veins), you can apply a sulfur-based fertilizer to correct the problem.


Nutrients are essential for the proper development of cannabis plants. Cannabis plants need a variety of different minerals and vitamins to grow properly. These nutrients can be divided into two main categories: macronutrients and micronutrients. Macronutrients are needed in large quantities and include things like nitrogen, phosphorus, and potassium. Micronutrients, on the other hand, are needed in small quantities and include things like iron, zinc, and copper.

Boron (B)

Cannabis requires very little boron, but it is still an important micronutrient. Boron is involved in the metabolism of calcium in plants, as well as the transportation of other nutrients like potassium and magnesium. It also helps Cannabis plants produce chlorophyll and build strong cell walls. A lack of boron can cause stunted growth, slow ripening of fruits and flowers, and yellowing leaves.

Chlorine (Cl)

Chlorine (Cl) is a halogen that is found in small quantities in all living organisms. In cannabis, it is required for the proper development of chloroplasts, which are organelles that conduct photosynthesis. Chlorine is typically not found in soil, but it can be added to the soil through the use of certain fertilizers.

Copper (Cu)

Copper is extremely important for chlorophyll and carotene production in plants, which gives them their green color and helps with the process of photosynthesis. Copper is also a key component in several enzymes, helping the plant to produce energy and form new proteins. A lack of copper can cause leaves to turn pale or yellow, and stunt the growth of young leaves.

Iron (Fe)

Iron is a key micronutrient for cannabis plants, and it is important for several reasons. Iron is involved in the process of photosynthesis, which is how plants convert sunlight into energy. Iron is also necessary for the production of chlorophyll, which gives plants their green color.

Cannabis plants need iron for healthy growth, but they can only absorb it in small amounts. This means that growers need to be careful not to over-fertilize their plants with iron, as this can lead to problems such as iron toxicity or deficiency.

Plants deficient in iron will exhibit symptoms such as yellowing of the leaves (chlorosis), stunted growth, and poor overall health. If you think your plants may be deficient in iron, you can test the soil or water using an at-home soil test kit or water test kit. These kits will give you a good idea of the general nutrient levels in your grow area and can help you troubleshoot any problems you may be having with your plants.

Manganese (Mn)

Manganese is a micronutrient that is required for the proper growth and development of cannabis plants. It is involved in several important plant processes, including photosynthesis, nitrogen fixation, and respiration. Manganese is absorbed by plants through the roots in the form of Mn2+.

Manganese deficiency is relatively rare in cannabis plants, but can happen if the soil is too alkaline or if there is a lack of Mn in the growing medium. Symptoms of Mn deficiency include yellowing of the leaves ( chlorosis), stunted growth, and reduced photosynthetic activity. mManganese can be applied to plants as a foliar spray or as a root drench.

Molybdenum (Mo)

Molybdenum (Mo) is an important micronutrient for cannabis plants, and it is involved in a number of key processes, including nitrogen metabolism and the development of strong roots. This nutrient is typically found in soil, but it can be depleted by heavy rains or irrigation. If your plants are showing symptoms of deficiency, such as stunted growth or poor root development, you may need to add more molybdenum to your soil.

Zinc (Zn)

Zinc is an important micronutrient for cannabis plants, and it plays a role in several key processes, including photosynthesis and the synthesis of chlorophyll. This mineral is also involved in the production of enzymes and hormones, and it helps plants to resist disease. Zinc deficiencies are relatively rare, but they can occur if the soil is extremely acidic or if the plant is growing under stress. Symptoms of zinc deficiency include yellowing or stunted leaves, and purple or reddish discoloration on the undersides of leaves.

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