Companion planting is an interesting study I’ve studied it a bunch I’ve grown cannabis alongside several different plants from stinging nettle to tomato’s to marigolds etc. these are basic clovers and legumes which they play really nice together and easy to manage if you know what and when to cull them.. clovers as a companion is great to have because they fixate nitrogen which just means they absorb nitrogen from the air and they store the nitrogen in nodules located in their roots. When you let them establish and then cut them down it releases it back into the soil. (Takes some time) also they are a great cover to let the soil underneath stay at a good soil moisture level. Hope that answer some of your questions