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Temperature for sprouting seeds
- Thread starter Treevly
- Start date
I think Fahrenheit was German.
I also think you meant Celsius.
I pop mine at room temperature 70 degrees Fahrenheit or 21 degrees Celsius.
I also think you meant Celsius.
I pop mine at room temperature 70 degrees Fahrenheit or 21 degrees Celsius.
There's a wide range of temperatures seeds will sprout at although occasional strains will need a specific temperature. Anywhere from 70-90 degrees F with 78-80 being the sweet spot. If you're going below 70 you'll need a heat mat. I regularly sprout seeds at 55-65 degrees with a heat mat but the lower the temperature the lower the germination rate. I've seen seeds sprout outdoors at 50-35 degree F temperatures with enough directs sun. There's a big difference in sprouting seeds with almost no light vs full lighting.
I don't have a lot of experience sprouting seeds above 80 degrees F so I can't comment on high temperature germination. It's probably similar to low temperatures, as you move away from the 78 degree sweet spot less seeds and strains will want to sprout. I've seen a strain that wouldn't sprout below 73 degrees for instance. It's rare though as long as you're above 70 with a light source you're fine.
I don't have a lot of experience sprouting seeds above 80 degrees F so I can't comment on high temperature germination. It's probably similar to low temperatures, as you move away from the 78 degree sweet spot less seeds and strains will want to sprout. I've seen a strain that wouldn't sprout below 73 degrees for instance. It's rare though as long as you're above 70 with a light source you're fine.
Ha that's exactly what I picture in my mind, what I have to search for in F or C degrees to describe. It's what I try to re-create with my heat mat. It was also my trick for quick drying sample buds right before harvest.
I got some popping up now and temps in the house have been 64 - 74 deg f. Jiffy pellets on a paper plate sitting on counter.
The supplemental heat source, heat mat, kitchen cupboard, cable box, or whatever is important when you don't have a direct light source heating the soil. This should be obvious but without the energy put into the soil the seedlings are going to have a hard time getting started. If you're sprouting under fluorescent lighting you should probably use a heat mat since the light isn't as warm as more powerful lighting.
However if it's 80 degrees already all a heat mat is going to do is dry your soil out too fast....
However if it's 80 degrees already all a heat mat is going to do is dry your soil out too fast....
My range is 20 - 25 degrees C.
I like to start them in the cool end. Give them time to soak. If too hot I've seen many sprouts destroying themselves by squeezing out of a hard shell that wont open for them.
If nothing happened on day 3 I move them to a place with more heat.
I like to start them in the cool end. Give them time to soak. If too hot I've seen many sprouts destroying themselves by squeezing out of a hard shell that wont open for them.
If nothing happened on day 3 I move them to a place with more heat.
