In article , Mary Fisher
writes

#

Do you mean that you make successive sowings throughout the year? And what
does 'tray or two' mean?

T be more correct, we use half seed trays for that. I sow three rows of
White Lisbon seed very thinly in potting grade compost. That results in
three rows of about 20 onions. When one tray is about half used up, I
sow the next. It can be done that way any time of the year, but the
growing time varies according to the season. It means we always have
fresh salad onions ready to use in a convenient place.
--
Alan & Joan Gould, North Lincs.