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How typically ought to i fertilize cannabis crops?


What do I feed my plants and how much? It's a hard question to answer, and the information you get will vary depending on where you look and who you ask. If you ask the major nutrient manufacturers they will point you out to an expensive line of multiple products and suggest that you feed your garden as much as you can without killing your plants. If you ask an earth mother guy, it might suggest messy, smelly organic teas and vegan composts are the way to go.

The main fertilizer elements:

Growing things need trace elements, nitrogen, phosphorus and potassium. They work these changes into the soil before planting, and without official standards, they vary from one brand of fertilizer to another.

However, you can look for the N-P-K on the label. These are chemical table symbols for nitrogen-phosphorus-potassium. These are displayed as a three-digit sequence that represents the percentage of the elements in the weight.

All-organic farmers mix their own fertilizers, but also risk unwanted chemical balances and reactions. All-organic or homemade fertilizers release nutrients slowly, reducing the risk of overdoing it.

Feeding plants will help them grow. But fertilizers make them produce. All soils have some N-P-K content, but growth will consume it without supplement. Cannabis fertilizers are readily available and vary from need to need. Since they pair fertilizers with the growth phase, you'll want to buy and use them as indicated. And each variety has its own schedule of rooting, budding, and flowering.


Seeds and clones do not need any help at their earliest stages. There's no point in giving them extra nutrients until they develop a rooster root.


The N-P-K requirements change over the course of the growth phase. For example, seedlings seek a ratio of 2-1-2. After three to four weeks, the early plants want more nitrogen at 4-2-3. And after five to six weeks they need even more nitrogen at 10-5-7. You should also follow the manufacturer's instructions for growing coconut air or hydroponics.


When the plants bloom, they need a boost of phosphorus. As each cultivar schedule nears flowering, you can use a 7-7-7 mix about a week in advance to help plant transition. Next, increased phosphorus enters the equilibrium. At the first flowering, the ratio is 5-10-7. Mid-flowering takes 6-15-10, and late-stage flowering benefits from 4-10-7.


  • The most effective and efficient fertilizers can be handcrafted. Compost and meals do the job, but they remain impractical.
  • It makes sense to prefer product lines that meet all of your farming needs. Some lines offer soils, fluids, nutrients, and fertilizers, each in line with their associated products.
  • Provide your weed plants with regular nutrients. The amount of fertilizer given depends on the size of the plant and its stage of growth.
  • Add the nutrients or fertilizer to the water before adding it to your cannabis plants.

  • Don't give fertilizer every time you water your plants. Too much fertilizer will damage the marijuana plants. The accumulation of fertilizer in the soil can make the growing medium acidic.
  • Cannabis plants are expected to grow tall and taller outdoors. The plants may need more nitrogen. A lack of nitrogen makes marijuana leaves look dull and eventually turn yellow. As soon as these signs are noticed on the plants, introduce a nitrogen-rich fertilizer.

(Updated, originally published 11/21/2021)

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