Garden and Flowers

Seedlings sown indoors have been nurtured in a protected environment’. They have not experienced any wind or terrential rain, and the differences between day and night temperatures have been slight. If plants are put out-of-doors suddenly in spring, the transition is sometimes too great and at the very least their growth stagnates. This is why they should be acclimatized gradually to outdoor conditions. Put them out-of-doors during the day and bring them indoors in the event of cold nights, heavy rain, or harsh winds. A cold frame is an ideal place for hardening off plants: they will then be out-of-doors, but protected by glass. Remove the glass during the day and put it back at night.

Sunflower that was sown early and is put under a cloche if the nights are cold.
Hardening off annual in a tunnel which is uncovered during the day.