All plants need nutrients to grow and cannabis needs approximately 14 nutrients in order to grow to their full potential. The first uses nitrogen, along with phosphorus and potassium that are both used by plants and will also be listed on fertilizer packaging. The proper fertilizer packaging will have them listed in that order, meaning that they have the correct percentages.

The other nutrients that are needed are referred to as secondary nutrients, are calcium, sulfur and magnesium.  Then there are nutrients known as micro nutrients and these are baron, cobalt, copper, chlorine, iron, manganese, and molybdenum.

The type of fertilizer the grower will look for is a 20-10-10 while the plants are growing, and then during flowering the fertilizer that will be used to have the best harvest is 5-20-10. Nourishing plants is just that, it is feeding the cannabis crop what it needs and the most common mistake is for beginners to over feed the marijuana plants and this will result in curled leaves. Another thing the grower should be educated about with fertilizers is when growing marijuana organic fertilizer is the way to go. Chemical fertilizers are not a wise choice, because the chemicals will be taken in by the plants and that means when the pot is smoked it will be filled with chemicals.

There are of course the standard organic fertilizers that have been used for centuries, which are manure from cows, chickens, horses, and even rabbits, but these are not advised to be used for the indoor garden. The odor from these prevents the use of them on indoor crops and using a purchased organic fertilizer to give the cannabis crop nutrition will not have the odor of these because it is made for house plant use.