I have a small suburban garden which has soil that has some clay content, but not too severe. I wanted to try to improve it this year by getting a truck load of compose to rototill in this spring (it's in NJ, so we plant around early may - tomatoes, peppers, squash...) My question is as follows: Is there a cover crop that I can plant now or early spring that will benifit the garden when tilled in around mid April or did I drop the ball by not having sown something this fall? It is a shame b/c we had temps in the 60s until two weeks ago, and I am sure that if I had planted something it would have totally produced tons of green matter. Any other suggestions to help improve the soil would be great. The problem is that the soil tills nicely, has no rocks, but then compacts by the end of the season due to the clay content. Again, it is not all clay, but the way it drains and compacts suggests to me some clay is there.