Marijuana Fertilization Tips

To grow to a large size, marijuana requires a steady supply of nutrients which should be added to the water on a regular basis. The following is a list of tips for fertilizing marijuana to ensure huge growth for your plants.


  • The elements Nitrogen, Phosphorus, and Potassium are considered the important nutrients for strong growth.
  • Calcium can be used to control the pH.
  • Adding ample Nitrogen ensures fast lush growth, enabling a Cannabis plant to outgrow almost any other plant.
  • Cannabis’ need for phosphorus is the greatest during the seedling and flowering stages of it’s life cycle.
  • Potassium is associated with strong sturdy stems and plants with a high resistance to diseases and pests.
  • Calcium is not added to the soil as a nutrient, but rather to balance the pH of the soil.
  • The amount of nutrients to add to the water depends on the size of the plant, the size of the pot, and the general condition of the soil.
  • Always add water when you add any nutrients or fertilizer to the soil.
  • It is recommended that you dissolve the fertilizer in the water before watering the plant.
  • Adding more nutrients than a plant requires will toxify the soil thereby harming plant growth and development.
  • Foliar feeding, or spraying the leaves with a fertilizer solution, is an ideal way of fertilizing large plants with nutrient deficiencies.
  • Nutrient deficiencies can best be detected by a change in the condition and color of the leaves.
  • Soil-less mixtures are a good alternative to using large amounts of soil, the main advantage being that the nutrient balance is easy to control.
  • The pH is the measure of how alkaline or acidic the soil is and it’s balance is determined by the amount of nutrients present in the soil.
  • Although marijuana will grow in soils with a pH between five and nine, it thrives in soils with a neutral pH of around seven.
  • Soils with a high content of organic matter are often quite acidic with a fairly low pH.
  • Calcium can be used to balance the pH.
  • Most nutrients are soluble in soils with a pH balance of between six and seven and a half.
  • Continued use of Nitrogen, Phosphorus and Potassium will lower the pH of the soil, this can be rectified by adding some Calcium.
  • To save over-fertilized plants, the soil can be leached by removing the top few centimeters and over-watering with lukewarm water.
  • Although healthy, strong growing plants love a steady supply of nutrients, you should never fertilize them every day.
  • A plant growing in a poor soil, low in nutrients will develop better than a plant growing in over-fertilized soil.
  • Although Carbon Dioxide cannot be classified as a true nutrient, it can been used to increase growth during the vegetative stage.
  • To balance the pH of an acidic soil, crush some egg-shells and soak them in water. Then strain out the shells and pour the water over your plants.
  • A soil rich in Nitrogen will increase internodal growth in the stems of developing young marijuana plants.
  • Urine is an excellent source of Nitrogen for marijuana plants, but as it is too concentrated to apply directly, it should always be diluted with water.
  • Unless the soil is poor in nutrients, a young seedling growing in a large pot doesn’t require any fertilizing for the first few weeks of it’s life.
  • Although Cannabis does not grow well in a soil with a low nutrient content, this is preferable to a soil that has been toxified by over-fertilization.
  • The influence of the soil, and in particular the nutrient content of the soil, to the potency of the plant is something which cannot be overlooked.
  • Nitrogen can be positively correlated with higher potency and increased growth, and it is the most influential nutrient available to the grower.
  • Organic fertilizers are less concentrated than chemical mixes, and as the nutrients are released more slowly, there is less chance of toxifying the soil.
  • A typical program of fertilization may be to fertilize after the fifth week of growth, and then every two weeks thereafter until flowering.
  • It is always better to fertilize your plants more often with a more diluted solution, than to give them concentrated doses at longer intervals.
  • Always make sure that the fertilizer is completely dissolved in the water before you apply it to your plants.

3 Responses to “Marijuana Fertilization Tips”

  1. can you use fertilizer for blooming flowers for blooming cannibus or does it have to be a fert. for veggies for cannibus thank you

  2. if you think your plants are approaching that stage , bloom booster products work very well.

  3. Schultz bloom plus or bloom booster by commercial companies that high phosphate ratios work great but should be used sparingly and used diiluted