The results from my experiment planting tomatoes with and without bottom heat :
Germination average using bottom heat: 5 days
Germination at room temperature: 8-9 days
Germination percentage wasn't affected.
I don't think the 3 day advantage is worth the effort (side note: if you try the Christmas lights route, don't use a styrofoam cooler. Either the heat or the weight of the plants or both caused the lights to partially imbed themselves in the cooler).
So my holiday lights are back in storage 'til next winter and the cooler is back in the garage and all of my seed pots are toughing it out without special treatment.
Have any of you tried bottom heat? Did it make a real difference for your plants?
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