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3 season greenhouse/seed germination

3 season greenhouse/seed germination
Posted by Linda/CT/zone 6 (kwyet1@hotmail.com) from CT/zone 6 on 2002-01-14 08:14:15

I have a 3 season (heavy duty vinyl opaque greenhouse cover) greenhouse. How soon in zone 6 can I start seeds? What if I use a heat mat?? The air in there is warmer than outside during the day...but is a couple of degrees colder than outside at dark. Thanks
  • Seed starting
    Posted by Kimm from 4a/5b-MI on 2002-01-16 13:13:57

    A heat mat probably would help since for most seeds a soil temperature of about 70 is needed, but how well those sedlings would grow after germination would depend on the greenhouse temperature which can be lower than that needed for germination. However you really don't want to start seeds too early since they do tend to get leggy. Depending on the seed 6 to 12 weeks before you can set them out is optimal and starting much earlier, in most of the studies I've seen, really doesn't get you a better head start since apparently there is a time when the seedlings are very conducive to transplanting and beyond that they pout.
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