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hi i planted seed in a heated propergater ,they germinated ok they started to grow .then sume just dired .why.
Were they too wet? i had that problem when i first used a propergator.
Did you remove the lid when the seeds showed, as Maud says, could be caused by 'damping off' they only need heat until they show.
what were the seeds Stephen? Some are more fussy and too wet is a strong possibility. I've never had great success with heated propagators. I have more success if I get them out of there as soon as they germinate, before they get rapidly growing soft leaves. They grow more slowly and stronger outside of the propagator. (This is my theory, not proven fact)
yes nutcutlet is correct, from bitter experience I've found that leaving the lid on trying to get all the seeds to germinate is more trouble than it's worth. I wait til roughly 50% of the seed has popped up before removing the cover or opening the vents. The 50% that haven't sprouted usually are just about to anyways, and after a week, you'll have a good batch of seedlings. Hope it helps and good luck.