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Hardening off is the process of gradually acclimating indoor-grown seedlings to outdoor growing conditions before transplanting. Seedlings raised indoors are not prepared for direct sunlight, wind, or fluctuating temperatures. A transition period allows plants to adjust physiologically and structurally.
Indoor seedlings develop under controlled environments:
When moved outdoors abruptly, plants may experience:
Hardening off strengthens cell walls, thickens leaf cuticles, and improves stress tolerance.
Begin the process:
Avoid starting during extreme heat, cold, or windy conditions.
This progression allows plants to adjust without stress injury
General minimum nighttime thresholds:
Avoid frost and chilling injury, particularly for tomatoes, peppers, cucurbits, and basil.
Sunlight must be introduced gradually. Indoor foliage is highly sensitive to ultraviolet radiation.
Too much sun too quickly can cause:
Begin with filtered or morning sun, progressing to full exposure.
Skipping hardening off may result in:
Even when plants survive, establishment may be delayed.
Yes. This is often called environmental conditioning and includes:
These adjustments simulate outdoor stress gradually.
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