hardening off

Gradual temperature adjustment

Hardening off is the process of gradually acclimating indoor-grown seedlings to outdoor conditions before transplanting them permanently.

Plants raised in controlled environments need exposure to wind, temperature fluctuations, and direct sunlight in increasing doses over a week or two: Start hardening off your tomatoes in early May.

Without this transition, transplant shock can stunt or kill them.

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last frost · cold · greenhouse · cold frame · outdoors · tender · exposure · gradual · growing season · weather · wind · sun · direct sunlight · shelter · toughening · nursery · garden center · spring

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acclimation method

hardening offcold shock

Physiological response to rapid cooling

transplant shock · abrupt transition · direct sowing

plant protection direction

hardening offcoddling

Overindulgent, protective treatment

sheltering · pampering · babying · overprotecting · softening

cultivation phase

hardening offgerminating

Starting to grow

propagating · seed starting

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hardening, harden, hard, harder, hardest, hardly, hardness, hardened, hardy

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