In article , Mary Fisher
writes

"Alan Gould" wrote in message
...

I have just sown a half tray of White Lisbon, we shall leave them in the
tray and use the onions from there as required. We do that about 4 or 5
times a year and that ensures us fresh picked salad onions all year.

Alan - do you mean an ordinary seed tray, about 2" deep?

Yes that's right - I pack compost into the tray fairly tight, leaving
just a little space at the top. I make three shallow grooves along the
length with the edge of a piece of glass, then I dribble seed into the
grooves as finely as I can - usually about 12 to 20 in each groove. I
cover the seed with fine compost or sand, then I stand the tray into
about an inch of tepid water until moisture shows at the top of the
soil. The tray is then covered with glass. If I'm doing it no paper goes
over the glass, if Joan is doing it she covers it with newspaper.

The tray is not watered again until the seeds have germinated and are
growing on. The first thinnings are taken very small so as to leave
about ten bulbs growing in each row - and that is about the right time
to begin the next tray, though that varies according to season. We keep
the tray inside, usually in the conservatory for convenience, or in the
polytunnel - the greenhouses are too hot for that job in summertime.
--
Alan & Joan Gould - North Lincs.