Hossgrows
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I'm not sure, being I grow outside. But I would think something in the upper 60°F range, or better.good point , the soil was 19oC , some nights it might have dropped down to 16-17 degrees and it rarely went over 21.
I dont think this helped. with my next grow i am going to leave my heat mat under the pot and perhaps have it come on half way through the dark period ....whats a good soil temp ? 22 oC?
I start seedlings indoors,with Ambient temp of around 73°F and no heat mat. But their off the floor at counter height, and wrapped in a blanket to help retain heat while lights are off.
I use the soil from my garden mixed with some potting soil, saturated days before planting the germinated seed. Then I only need to water lightly when needed, and don't worry about dry spots.
My way of tempering them to the soil in which they will eventually be planted in permanently.