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Looped 4"-6" below the soil surface, this cable works like an underground sun to heat the soil and speed germination and seedling growth with gentle bottom heat. Works best in an enclosed, insulated, and covered planting box. Not designed to work in outdoor beds.
Caution: Never allow the cable to cross or touch itself while plugged in or the heating cable will not function properly.
First off I used a single 48' unit in 4X8 beds. Compared to an unheated bed raised the soil temp 10 degrees F. The information suggests 4 feet for each CF Im using .66 and is sufficient for my use and did not want to use that much electricity.Review by Scott (on 4/29/15)