There are hurdles to Psychotria viridis cultivation in the southwest American desert: Occasionally freezing weather is one of them. I designed and constructed a soil heater. Materials: fiberglass tubing from Max Gain Systems, RT-12, OD .5", ID .25". Also nichrome wire, 26 gauge at 2.6 ohms/foot. I pushed the wire into teflon 22 gauge teflon tubing before inserting it into the fiberglass tubing. Total resistance is 122 ohms = 108 watts for 115 VAC power.
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