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Arthur, English biochemist and Nobel laureate, 1865-1940. See: Harden-Young ester.
References in periodicals archive ?
Early outdoor varieties can gradually be hardened off for planting in a fortnight's time.
Plants need to be hardened off gradually under a cloche and planted in soil that has been warmed under a cloche beforehand.
Those tot plants bought at great expense might not survive a night in the open unless they are first hardened off by being placed outside on warm days for at least a week before transplanting, while being tucked up safely for the night in a shed, greenhouse or cold frame.
Seeds should be planted inside during March and April, then hardened off and sown outside in May and June.
PLANT out sweet peas which have been hardened off. Add them to bean wigwams or plant them up in new areas of hedging or fencing.