The main thing I find with the bottem heat is you need to watch the water in the pot a little closer the heat will evorapate it quicker. I don't leave plants on it much more than 4 weeks by then they seem to have established enough to go it alone.
I do use thermostats on my heatmats as a just in case thing I place the probe in a pot with PA about 2" off the bottem and fill it with water just like I'm growing an orchid and the probe it the plant. Ive had a couple heat mats thermostats go nuts and really get hot.
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