Rejuvenating a Leggy Poinsettia: Hard Pruning, Repotting, and the Photoperiod Requirement for Rebloom

Four‑Year‑Old Poinsettia in Minnesota

The plant is leggy and sparse. Hard pruning and repotting will force bushy new growth.

Rebloom Protocol

1. Cut all stems back to 6‑8 inches.
2. Repot in fresh soil, larger pot.
3. Summer: dappled shade outdoors, regular water/fertilizer.
4. Fall: From late September, give 15 hours of uninterrupted darkness (5 pm–8 am) daily—no light leaks.
5. Color develops in 8‑10 weeks.

This strict photoperiod is mandatory for holiday blooms. Many discard poinsettias because the regimen is demanding.