Okay, so you want to grow your plant in a clay pot. If you are a first-time grower, start with pre-fertilized soil. This is the best soil for weed in case you don’t want to use any additional nutrients. Or you could create your own marijuana soil mix rich in phosphorus, nitrogen, and other essential elements. Enrich the soil with some of these components: peat moss, manure, coco fiber, and/or guano to achieve exceptional quality.