You do not need to obtain new dirt whenever you want to plant cannabis plat in a pot. If the dirt is disease and insect-infested, you can’t use it, but when it is not, you can reuse it. By minding and reusing good old dirt, you’ll be keeping your costs on developing cannabis low. Cannabis plants suck a lot of nutrients with the support of soil microbes when they’re planted. During the vegetative phase, they need nitrogen, and throughout the flowering phase, they need magnesium and calcium. So it is secure that after picking out your cannabis, the plant may have obtained all the nutrients in the soil.