As binley100 said..
They're too warm with insufficient light. I'd move them off the radiator and onto a window sill. If you have curtains, be aware that closing them on a cold night can sometimes create a cold pocket between them and the window which won't do your seedlings any favours. Turn the tray 180 degrees every few days. In the absence of grow lights, you want to aim for good, natural light, but fairly cool temperature, so the seedlings grow steadily but strongly (they'll pick up pace anyway as spring approaches). Don't over water; the seedlings are still at a very vunerable stage.
Don't worry to much about them being leggy. When you come to re-pot, just bury the stems up to the first pair of leaves in compost; over time the buried stem should sprout additional roots, which is only a positive thing.
They're too warm with insufficient light. I'd move them off the radiator and onto a window sill. If you have curtains, be aware that closing them on a cold night can sometimes create a cold pocket between them and the window which won't do your seedlings any favours. Turn the tray 180 degrees every few days. In the absence of grow lights, you want to aim for good, natural light, but fairly cool temperature, so the seedlings grow steadily but strongly (they'll pick up pace anyway as spring approaches). Don't over water; the seedlings are still at a very vunerable stage.
Don't worry to much about them being leggy. When you come to re-pot, just bury the stems up to the first pair of leaves in compost; over time the buried stem should sprout additional roots, which is only a positive thing.
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