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wicking waterer and heat cable— not possible?

Posts: 1699
Location: Denver, CO
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I want to turn the whole of my cold frame into a wicking water, like the ones shown here. http://deepgreenpermaculture.com/diy-instructions/self-watering-tray/ This would be a big advantage, since things dry out fast here in Colorado, and I am very busy. I will be starting hundreds of plants for the Saint Isidore Society farm and for my home garden. The cool weather things will go in an unheated greenhouse.

However, I also need to start lots of tomatoes and peppers. I was planing to heat the frame with a heating cable under sand. Would this make water evaporate so fast as to make this watering system impossible?
Posts: 3604
Location: Kansas Zone 6a
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Shouldn't. Yes, it can evaporate water but it should stay contained with the frame and rain back down, like a terrarium.
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