[Yorky]

I sowed some tomato seeds in modules with a plastic lid last Sunday (8 days ago) & placed them on a heat mat in a lean-to greenhouse.

The seedlings are now touching the top of the lid - can anyone advise what to do next?

I'm thinking of potting them up & then:

placing clear plastic bags over them or
putting them on the kitchen window board (but the house is not warm)

Also, I sowed celeriac & onion seed at the same time but they haven't germinated yet - is that normal?

Thanks in advance.

[tippben]

If they have one or two sets of true leaves, I'd immediately pot them on into 9cm pots, planted up to the leaves, as roots will grow from the stem. Definitely don't leave them touching the plastic cover. They can sit on the windowsill, or under some sort of cloche/greenhouse/polytunnel, as long as you bring them in if frost or low temperatures are forecast.

[Yorky]

hanks for the replies.

I kept the lid on to keep the moisture in as a constant 20 degrees will dry out the soil otherwise, then to bring them out of the lean-to to water will dramatically lower the temperature.

There are just two cotyledon leaves with leggy narrow stems at present - is it too early to pot them up?

[Margo]

It sounds like they've grown to quick. If they are leggy you might lose them if you repot them.
Try doing some more and don't put it on the heated pad. Just a cover over the top. The heat has brought them on to quick.