Giving Seedlings the Cold Treatment

oakley · January 2, 2020

For germination, the seed likes some bottom warmth, like a heat mat.

Once emerged, first set of true leaf or earlier, off the heat.

No moving around in and out. Continue your grow in a cool room or garage 55-60º or what
similar temps you have that remains steady.
(my grow room is 60-62º)

You could try an un-heated room or your garage not near the door.

You should read through these pages as many are giving their various experiences.

you may be thinking of 'hardening off' ?...even that process should be less high-low
in-and-out temps. Though sometimes unavoidable with unpredictable weather.

January 2, 2020	#35
oakley Tomatovillian™ Join Date: Jun 2015 Location: NewYork 5a Posts: 2,303	For germination, the seed likes some bottom warmth, like a heat mat. Once emerged, first set of true leaf or earlier, off the heat. No moving around in and out. Continue your grow in a cool room or garage 55-60º or what similar temps you have that remains steady. (my grow room is 60-62º) You could try an un-heated room or your garage not near the door. You should read through these pages as many are giving their various experiences. you may be thinking of 'hardening off' ?...even that process should be less high-low in-and-out temps. Though sometimes unavoidable with unpredictable weather.