Cannapedia Encyclopedia of cannabis strains


Fertilizers feed and nourish your plants. Too much of the good stuff can damage or kill them, however.

Things that grow need trace minerals, most importantly nitrogen, phosphorus and potassium (abbreviated as N-P-K). These added substances should be worked into the soil before planting. As there are no officially set norms, individual brands of fertilizers significantly differ from one another.


Key components of fertilizers

However, the ratios of nitrogen, phosphorus and potassium can be checked thanks to the numbers stated under the abbreviations N, P and K on the product’s packaging. They are presented as three figures in a row and they show their content.

Farmers who focus on purely organic production prepare their own fertilizers. They too, however, risk the possibility of an undesirable chemical ratio and reaction. Purely organic or homemade fertilizers dispense nutrients slowly, so there is almost no risk of over-fertilizing.


How to fertilize

Fertilizers differ depending on the method of growing – some are made for soil, others for perlite, coconut fiber etc. Unlike soilless growing media, soil has the advantage of already containing some amounts of nitrogen, phosphorus and potassium. However, plants use them up and don’t save supplies during their growth. It is therefore necessary to fertilize plants in soil as well.

You can find fertilizers made specifically for cannabis that have been tailored to different phases of its growth. They are supplied with a guide for the different stages (planting and rooting, the growth phase, flowering).



The most effective and potent fertilizers tend to be the homemade ones. Compost and food leftovers will do, but it is not very practical. If you’re buying a ready-made mix, choose a product line that covers all your needs and phases or growing. Some product lines offer soil, nourishment and fertilizers that are completely balanced for the whole life cycle of your plants.