Small pop up green house reached 110 degrees F

Hey all,

Last night I seeded a variety of perennial seeds in trays ( mountain mint, Monarda,  St. John’s wart, etc. ) and set them outside in the pop up green house I just got. It was pretty chilly today but when I checked the green house, which I had zipped up, and it was incredibly hot, I’m guessing about 100 to 120 degrees F. I’m worried I lost everything but hoping that perhaps since it was the first night/day maybe some of the seeds serviced. Anyone have any thoughts or experience with high high temps and seed germination rates.


Thank you

If they hadn't sprouted yet I wouldn't be too worried.  I doubt the soil got too hot for too long.  You'll know for sure in a week or two if they don't sprout.

I hope your seeds are OK, but have you figured out how to prevent a repeat? This is an issue with small clear containers with no opening where I live also which is why I gave up on the whole "cloche" idea. Maybe figure out where the sun will first hit it from and get something that will shade the container until late enough you're sure you will get to it and open it up?  Good luck on germinating them.

I accidentally cook my plants every year. It's the heat mixed with the plastic that COOKS plants and roots down here. I wrecked some of mine a few days ago but after another cool night and some rainwater, everything bounced back. If the seeds aren't germed yet, like another poster said, you're good to go. You gotta open it up before sun hits it. At 9am my greenhouse will be 60 closed up, by 1pm it'll be 120 in there on a 80 degree day.

I'm currently using a rebuilt version of one of the cheap greenhouses.  The last few days have been overcast, but once it gets daylight,  the greenhouse starts to warm up.  I unzip both sides of the door zipper up to the bottom of the third shelf on most days.   Today it was over 70 degrees by 11:30, so door was unzipped all the way and folded back.  Every evening I zip it back up and start over again.  

If your seeds hadn't yet germinated,  there's hope.

Thanks for all the replies! I'm feeling much more hopeful that the seeds will persevere and start germinating but I won't know for a few more weeks.  Those little pop up green houses really do get cookin'

Yeah,   I have one of those little ones and it's just so hard to regulate temps.  I mostly leave it unzipped and then just bring "hot weather" seedlings into the house at night and try not to start things too early.