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Anyone use heat mats for cuttings?

mxk3 z5b_MI
2 months ago

I had some cuttings in the south-facing windowsill that were doing well, or seemingly so -- nice stocky, healthy green top growth. I re-potted them and noticed the soil was cold and there wasn't a lot of root growth for them being a couple months old and already transplanted into 4" pots. So I decided to move them to the basement on the light cart and put a heat mat under them, thinking it would help generate more root growth. I generally don't have too much trouble with fair to good root growth of seedlings under these lights, the basement is heated and there's some heat generated from the light boxes, so I'm not really sure if the mat is needed. What do you think - should I keep the heat mat or remove it, is it really necessary?

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