Has anyone heard of a product called Wall of Water? Basically, if I can describe it, it's a sheet of pale green heavy duty plastic that is in a circle shape. There are channels that are vertical. The channels are filled with water and you place the ring of water around your tomato plant or any other heat loving plant you would like to give a head start to. I bought a package last fall and have been waiting for the opportunity to try it out. We are having a very cool, wet spring so I thought I would try the Wall of Water with one tomato plant. The instructions say to fill the Water of Water and put in place one week prior to planting. This is supposed to heat the soil. Well, who needs instructions? I saw the ground was dry enough to dig and took the opportunity to plant and then place the Wall of Water. After 5 days I checked the progress and was impressed. The tomato plant had doubled in size! So, I filled another Wall of Water and planted another tomato. At this rate it's going to take for ever to get those tomatoes in the ground.