If you are really interested in Plasticultre Write to Dr. Michael D. Orzolek Professor of Vegetable Crops Dept of Horticulture 203 Tyson Building University Park PA 16802 Request Vegetable Research Reprot 1998 Plasiculture Research Reasons: You will find different colors affects different crops. Dark colors warm the soil for Northern gardeners White and Silver help cool the ground for southern growers. Red helps plants like tomatoes that do better if they think there are competing Blue helps turnips. Yellow attracts bugs. Even over a 10 year period different colors make a difference If it really hot summer, White or silver work better, if its a cold summer black is better. After reading all this stuff I was back to duh?? Byron