Welcome to A4A.
My plot neighbour covers their plot in black plastic sheeting, the kind that lets the water through. In the spring they gradually roll back the plastic and plant things. I was amazed that in one plot up popped the asparagus.
Many thanks for reminding me, I must get some to cover my asparagus.
You can get it from Amazon and there are quite a few on ebay. Perhaps someone else will suggest the best place to get it.