[m1ckz]

morning all, i started my kelsae onion seed end of dec in a unheated conservatory, they germinated well an now are 4 inches, BUT the have flopped over ,an just lay there,mayed asleep lol , any ideas please  ty mick

[Kleftiwallah]

Damping off ?  Does this affect onions ?    Cheers,   Tony.

[Trillium]

Yes, damping off does affect onions.

The coolness very likely activated a fungus called damping off which kills seedlings at the soil level. Once gone (flopped), there's no revival.

Try reseeding the onions but this time top with a layer of vermiculite or fine gravel to minimize the fungus growth. And don't water too much as this contributes to the fungus damage.

[Yorkie]

The initial watering can be done with Cheshunt Compound (if it is still on the market) to try to prevent damping off, too