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1835 Floricultural Cabinet 3 175 As soon as they are rooted, pot them off singly into small pots, and manage them the same as to watering, re-potting, and hardening off, as before detailed.

1864 Trans. N.Y. State Agric. Soc. 1863 23 724 If in boxes, they must be taken from the tank, and at once placed on the hardening off table.

1912 Chambers's Jrnl. Dec. 848/1 Plants raised in this frame require no hardening off.

2006 Gardens Monthly Apr. (Reader's Digest Compl. Veg. Gardener Extract) 28/3 Young plants can start their hardening-off process in the closed frame, with more ventilation given day by day until the frame lights are left open entirely.