In nature, it's rare to find bare soil, exposed to the elements. Except for human or animal intervention and cataclysms such as landslides or wildfires which temporarily denude it, natural soil is always covered with some kind of vegetation or other. And if you're a gardener trying to maintain a clean vegetable patch, you'll be acutely aware of this, as no matter how much you try to keep the weeds away, they just keep coming back to colonise the bare soil. This is because living soil needs plants to grow in it so it can stay alive, it's just nature's way of keeping soil in optimal health - and we can all learn a thing or two from nature!
The gardening techniques that mimic nature in this way, such as using cover crops, green manure and mulching are fundamental pillars of sustainable organic agriculture, in particular in no-dig or no-till cultivation systems. Depending on how they are managed, cover crops can prevent soil erosion, suppress weeds, increase biodiversity, reduce irrigation requirements, contribute organic matter to the soil and maintain healthy microbial populations in the root zone, all of which can greatly benefit the main crop: cannabis, in our case.