Hi! I've sectioned off a large area of land that I'm adding manure, compost, and other scraps to daily. I mix it, till it, etc. Recently, I planted some garlic, and it appeared to be growing fine, with green shoots growing a centimeter a week. About two months later, the entire stalk wilted. I dug it up in a panic, and realized the garlic was mushy and not developed. I deduced it must be my soil, and I thought about how to amend it. It's a bit sandy, but when watered, it hardens. Not like a rock, but hard enough that it's difficult for a plant to grow. I researched, and decided I need to add coffee grounds, but is there anything else? I was thinking about buying some worms, making a compost pile, then adding worm castings and such to the soil, then when the soil improves, add some worms into the dirt to improve it more. I know that they're needed, but my soil has no worms to my knowledge. Is adding worms, worm castings, and coffee grounds all that I can do? Is there anything else that I can do to improve the quality of my soil? Thanks for all answers.