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.

Martin