In article , JimM
writes
I want to harden off the plants I've grown in the greenhouse prior to
planting out. Will just leaving the greenhouse door open during the day
allow enough 'cold' in to help the plants adjust or do I have to take them
all outside each day.

You need, over a period, to get the greenhouse temperature to equal the
outside temperature at night. Start by leaving the door open during the
day, then leaving it open at night too on warmer nights.
--
Kay Easton

Edward's earthworm page:
http://www.scarboro.demon.co.uk/edward/index.htm