Sun Scald on Impatiens Seedlings: Hardening Off Is Essential

Why Impatiens Leaves Turn White After Moving Outdoors

White, bleached leaves on greenhouse-grown impatiens moved directly into sun are classic sun scald (also called leaf scorch). Impatiens are shade lovers, but any indoor-started plant needs gradual acclimation.

The Hardening-Off Process (7–10 Days)

1. Day 1–2: Place in full shade/protected porch for 2–4 hours.
2. Day 3–4: Increase to 4–6 hours in dappled shade.
3. Day 5–6: Morning sun (2–3 hours) + afternoon shade.
4. Day 7+: Full day in dappled shade or morning sun only.

Recovery

Damaged leaves won't revert, but new growth will be normal. Keep plants in bright shade, water consistently, and avoid fertilizer until established. They'll recover in 2–3 weeks.

Prevention for Next Year

Start hardening off 10–14 days before your planned planting date. Never move tender seedlings straight from indoors to full sun.