ts really important to give your plants a chance ‘toughen up’ or ‘Harden off’ before planting out in the garden.
Its not just the change in temperature, they also have to get acclimatised to, lower humidity and increased air movement.
We move our plants from the greenhouse or polytunnel outside but under cold frames for 7-10 days.
Then for another period we will remove the cold frames but still give the plants some wind protection. A wall, close to the home or for us the side of the greenhouse is ideal.