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in Fruit & veg
I can only think they are too warm.
Can you post a pic please - that might give us some clues.
Damping off maybe, water from underneath and only when the compost is dry to the touch.
My broccoli has a light yellowy edgers on the leaves any ideas to what this could be
I planted broccoli, cabbage and cauliflower in Feb, and germinated in a propagator, and they popped up, but then shrivelled once I potted on. I planted the same seeds in an unheated greenhouse three or four weeks ago, and bingo, I have lots of little plants. Someone said at the time I had planted too early and the centrally heated environment of the house, plus not so much light had done for them. Now, outside, the same seeds are fine. Some have even gone into the beds. Trial and error it was for me.
I planted out sprouts several weeks ago; they looked very sad initially, but have revived. Do remember to cover them with netting to protect from birds when planted out. The only things left in the greenhouse at the moment are very tender, like Morning Glory.
I grow very few brassicas now, but in the past I always sowed them in a seedbed in the veg patch. I found that they grew into sturdy seedlings and were ready to plant out at the same time as those started inside earlier by other gardeners - the only problem was slugs and pigeons - lots of sharp grit incorporated into the seedbed seemed to deter most of the slugs - beer traps got the others. Nets kept the pigeons off.
Most brassicas are hardy in the UK and prefer cooler temperatures rather than beng molly-coddled.