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Head lettuce germination

Posted by mlarsen_grower AL (My Page) on
Sat, Jun 28, 08 at 20:42

I have been growing head lettuce and baby leaf lettuce for about a year. All of a sudden I can't get my had lettuce to germinate. I sow in a light potting mix in 72 cell. The soil is nice and moist, but not wet. I either sow directly on the soil surface or sew and then cover with a light layer of vermiculite. I then cover the container with plastic wrap to contain the moisture, place on a grow table under light and ... nothing happens. My seed is good because I have sown it directly in the grown for baby lettuce and had no trouble with germination. I have also successfully germinated these varieties previously. Any suggestions would be appreciated.

Follow-Up Postings:

RE: Head lettuce germination

Lettuce needs cool soil and the seeds do not like to be covered so skip the vermiculite covering.

What I do is sow seed directly onto soil blocks, water and cover with a piece of plastic just to keep moisture in the dirt. I do not put them under lights until they germinate.

I know some people put the flats in refrigeration in the summer to get the lettuce to germinate

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