Harden

(redirected from hardening off)
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Harden

1. To secure a computer system to make it more likely to withstand an attack from a hacker.

2. See: Hard asset.
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Tunnel cloches, either of plastic or glass, are a British invention dating from the beginning of the 20th century, and are just as useful for hardening off in the colder parts of Wales, and also for growing less-hardy vegetables.
It's best to wait until late May or early June to plant out after hardening off.
If you have raised annuals as half hardies in the greenhouse then you can plant them out now after hardening off.
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 raised from seed and cuttings - gradually acclimatise them by leaving them outside somewhere sheltered during the daytime.