Last spring / summer / fall, it was so wet, the only things that thrived were the weeds. I've got pretty heavy clay soil. So, this fall in an effort to create an environment with a little more drainage, I created a raised bed out of cement blocks. I filled it with composted cow manure. The manure has been sitting in a pile for a year so far, some for 2 yrs. I plan on covering it with black plastic in the spring to kill any weed seeds, then keep it heavily mulched. Can I plant directly in this next spring, or should I plan on tilling in some dirt?