In article , Martin & Anna Sykes
writes
I'e grown 3 trays of perennial wildflowers ( 288 mini-plugs ) for a small
wildlife area. They're currently growing slowly in the greenhouse.

Should I harden them off and plant them out soon or should I just leave them
in the trays until early next year? I'm a bit worried they'll get
overcrowded and turn weak and spindly if left where they are although they
are growing quite slowly now so I may get away with it.

I would overwinter in cool greenhouse. They won't grow much over the
winter, and it's a bit late to disturb them by planting them out now.
Don't overwater, pick of any dead leaves to discourage mould. You'll
lose a few, but not as many as if you put them outside.
--
Kay Easton

Edward's earthworm page:
http://www.scarboro.demon.co.uk/garden/