Harden

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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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Hardening off can be done in one of two ways: either in a cold frame where you can simply lift the glass up and down or by putting the plants out during the day and bringing them in at night.
That means hardening off before transplanting in the garden, hanging basket or patio container, a procedure once followed as a matter of course but not something that occurs to all gardeners nowadays.
If you have raised annuals as half hardies in the greenhouse then you can plant them out now after hardening off.
Pot up rooted cuttings of chrysanthemums and plant out well rooted plants 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.