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Arthur, English biochemist and Nobel laureate, 1865-1940. See: Harden-Young ester.
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When the plants have been hardening off for at least a week, and the soil is ready to receive them, check your weather forecast.
I know it's a bit early, but if you have a greenhouse or coldframe, you can make the first sowing of broad beans, one bean per 7cm pot, now and then plant them out after hardening off in April.
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.
1 Hardening off - we all know the old saying about 'ne'er cast a clout till May be out.
Sow seeds singly in pots indoors on a windowsill or heated propagator in late April and grow in a cool room, gradually hardening off the plants.