Last Updated on August 16, 2022 by Real Men Sow
Many of my seeds may have failed to germinate and it may be because the heating mat is way too hot for seed germination. Usually, it is too cold, in the wintertime. However, mats should be 20 degrees Fahrenheit above the ambient temperature. Spring may be extremely warm, especially inside the house. I measured the temperature of the soil in the small pots and it was between 95-110 degrees Fahrenheit. It was way too hot for my seeds.
So, it’s best to buy a soil temperature thermostat to control the temperature. Having a thermostat can help you control the heating mat’s temperature better. However, if you can’t buy it yet and you have seeds to germinate, you can also add a partition between the bin and the seeds (like cardboard or a bathing towel). This way, the seed tray is a bit elevated and not directly on the heating mat if it gets too hot. Make sure to check the soil temperature too from time to time.