Seed Germination Trouble-seed heating mat too hot!

Some new tomato seedlings coming up among the others

This year I have been struggling with my seed starting this year. Many seeds have not germinated. The seed germination mats seemed way too hot. I’ve never had this problem before (usually it is too cold) but when I did some research, I found out the mats are suppose to be 20 °F over the ambient temperature. This spring so far has been very warm (especially inside the house even without the heat on) and when I took the temperature of the soil in the little pots it was between 95 and 1oo°F! Way too hot for germination. No wonder very little was coming up—I’ve been frying the seeds!

So I got a soil germination thermostat that will control the temperature which I keep at 80°F and within 3 days I had 11 tomatoes come up. Wow what a difference. I will have to replant some tomatoes seeds but hopefully I will be fine. Guess I won’t have to worry about the plants growing too big this year before I transplant them in the garden.

3 comments on “Seed Germination Trouble-seed heating mat too hot!

  1. Glad you figured it out! This spring has been incredibly warm…poor little fried seeds! 😉


  2. Sam Sesna says:

    Thanks to your article, I found my seed mat was also frying my seeds w/ no germination.
    Thanks again!


  3. Kris McDonald says:

    Yep. Thanks for this. This just happened to me! I now have the thermostat and will start over.


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