Propagation: When to remove from heating mat, 1 by shanker34

shanker34 wrote:
Is there a general rule when I should remove my seedlings from the heat mat? I have one flat of impatiens and two flats of petunias. A good majority of them have sprouted (I will try to attach a picture) but I am not sure when I should turn off the heat mat.

I tried this method with some Hibiscus, Lobelia, and Gomphrena. They all came up really well under the lights and heat mat. When they got to about 1 inch in height I took them off of the heat. All three flats died within a week.

I'm not sure what to do. Any advice?

Thanks!