http://www.durgan.org/30%20September%202006%20Parsnips%20Over-wintering%20Composting/HTML/index.htm http://xrl.us/rzba 30 September 2006. Parsnips pulled today trimmed, washed and stored in peat moss in a paper bag. The largest is about 4 inches in diameter and 16 inches long. The vegetation is cut up in the yard machine and added to the compost pile. The garden is planted in red annual clover for over-wintering. I throw the seed on as space become available, hence the different heights in growth. In early spring the clover is roto-tilled into the soil, which effectively kills further growth if any survives the winter cold, Zone 5. Durgan.