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harden off

British  

verb

  1. (adverb) to accustom (a cultivated plant) or (of such a plant) to become accustomed to outdoor conditions by repeated exposure

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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Remember to harden off, or acclimate, homegrown starts by giving them a few midday hours of sunbathing for about five days before planting them outside.

From Seattle Times Apr. 28, 2022

If possible, move the potted seedlings into a cold frame to harden off for a few days before planting.

From Seattle Times May 19, 2016

You can leave the tubers in the ground for a couple of weeks to harden off a bit, and then lift them carefully with a garden fork.

From Washington Post

Grow on steadily and gradually harden off in readiness for planting out after the Wallflowers and other spring bedders have been removed.

From The Culture of Vegetables and Flowers From Seeds and Roots 16th Edition by Sutton and Sons

Gradually harden off, then place them in a sunny situation out of doors, and remove them to the conservatory in October.

From Gardening for the Million by Pink, Alfred

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