seed starting soil temp?

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homebrewer
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Joined: Fri Jan 29, 2016 8:58 pm
Location: FL Zone 9B

seed starting soil temp?

Post by homebrewer »

Hi everyone. I'm new to this, so I hope you don't mind the newbie questions. I started 16 cells last week and yesterday a few of them germinated. I put them under 4 100w (equivalent) CFL bulbs. Two at 6500k and the other two at 2700k. The lights are about 4-5 inches above the top of the stems. The flats are in an aluminum roasting pan in a bathtub we never use. The bulbs are generating some heat so I wanted to check the temp. The air temp at plant level is about 75F, but the soil temp has shot up to 90F. Thee is no heat source other than the bulbs. Is this normal? Will the high soil temp hurt the seedlings? Thanks for your help.

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applestar
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Re: seed starting soil temp?

Post by applestar »

Sounds about right for eggplants and peppers to germinate, a bit higher than needed/ideal for tomatoes and too hot for seedlings after germinating. What are you growing?
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imafan26
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Re: seed starting soil temp?

Post by imafan26 »

It is probably the tub and foil pan. They conduct heat and you probably don't have a fan either for air circulation. You could probably remove the lower lumen bulbs and still get enough light for now. The light would only be on for 14 hours so the soil will have some time to cool off a bit. Open the window a bit to let more cold air in. Try to get the air temp between 65-70 degrees it should help. As the plants grow the lights will go higher so there will be less direct light heating the tub and the pan.
Happy gardening in Hawaii. Gardens are where people grow.

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applestar
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Re: seed starting soil temp?

Post by applestar »

I was thinking about what you advised the new member from Phillipines @imafan -- what about putting the pan on a riser -- maybe cooling rack or roasting rack, broiler pan....?
Learning never ends because we can share what we've learned. And in sharing our collective experiences, we gain deeper understanding of what we learned.

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applestar
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Re: seed starting soil temp?

Post by applestar »

FWIW, these are also good temps for starting cucurbit seeds, especially melons and watermelons, as well as sprouting and growing sweet potato slips. :wink:
Learning never ends because we can share what we've learned. And in sharing our collective experiences, we gain deeper understanding of what we learned.

homebrewer
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Joined: Fri Jan 29, 2016 8:58 pm
Location: FL Zone 9B

Re: seed starting soil temp?

Post by homebrewer »

Thanks for all the input. I am growing...
Tomatoes
Green/Red Peppers
Summer Squash
Cherry Tomatoes
Watermelon
Cantaloupe

nothing too exotic. I will try the fan idea and maybe get rid of some of the foil.

mauser
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Location: Forest, Va zone 7a

Re: seed starting soil temp?

Post by mauser »

For future reference all you need to start inside from that list are the peppers and tomatoes.
Zone 7a Virgina. Go Pats, Bruins, and Red Sox.

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