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Arthur, English biochemist and Nobel laureate, 1865-1940. See: Harden-Young ester.
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While your seedlings are hardening off, prepare the planting space by amending the soil with compost and mixing in an appropriate amount of your favorite organic fertilizer.
Hardening off plants is the process of getting indoor plants accustomed to outdoor temperatures, seven to 14 days before transplanting them, by gradually exposing them to new light sources, temperature variations and water amounts.
Start hardening off plants raised from seed and cuttings and gradually acclimatise them by leaving them outside somewhere sheltered during the daytime.
Begonias and busy lizzies, for instance, are very easily killed by late frosts, even after hardening off.
The main activity this month with bedding plants is hardening off. This calls for moving the seedlings into a cooler and fresher environment to get them used to the conditions they will have to face outdoors.
Anything grown in a frost-free greenhouse such as patio plants and frost-tender vegetables will need hardening off before being planted outside, to acclimatise them slowly to outdoor conditions.