Kenneth,

Depends on the plants. Anything that normally requires warm
temperatures to grow will do much better if you leave the heat on. For
example, I keep tomato and cactus seedlings on the heating pad until it is
time to harden off in preparation to moving outdoors.
As noted by another reply, plants that require cooler temps should be
taken off the heating pad after germination. For example cabbage and
primula.

--beeky

Kenneth wrote:

Howdy,

I am starting some plants in a rather cool garage. I currently have
them on a heat mat to speed germination.

I want to know more about the effects of the heat from below after the
plants have germinated.

Generally, is it useful to leave the heat on? If not, what are some of
the likely disadvantages?

Sincere thanks,

--
Kenneth

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