harden

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Synonyms for harden

Synonyms for harden

to make or become physically hard

to make firmer in a particular conviction or habit

to make resistant to hardship, especially through continued exposure

Synonyms for harden

become hard or harder

make hard or harder

harden by reheating and cooling in oil

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make fit

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References in periodicals archive ?
If frost is forecast during the hardening off period, provide additional protection by stuffing straw into the cold frame.
Hardening off is important when it comes to growing tomatoes outside, and ones grown in this way are better than those grown in greenhouses during most seasons.
Hardening off is just getting them acclimatised to the colder nights outside and you an use a cold frame or even the shelter of a wall to give them a bit of half-way protection.
If you have raised annuals as half hardies in the greenhouse then you can plant them out now after hardening off. True half hardies are best left until the last week of the month.
Early May is still not safe from the risk of frost but if you want to be bold then you can try hardening off half hardy plants and planting them out.
Start hardening off plants that have been raised from seed and cuttings - gradually acclimatise them by leaving them outside somewhere sheltered during the daytime.
Start hardening off plants raised from seeds and cuttings - gradually acclimatise them by leaving them outside somewhere during the daytime.
IN mild and sheltered areas, start hardening off bedding and other plants which have been grown on under glass.