Crown Rot in Large Phalaenopsis: Emergency Response

Large Phalaenopsis Loses All Leaves to Crown Rot

Katherine's large Phalaenopsis (gift 5 months ago, mature, 30 large blooms) had emergency repot in May (humidity change, wrong mix)—success, continued blooming. Recently moved, stopped careful observation, watered without checking. Left large puddle in top two leaf pockets. Rotted all leaves away in 3 days (smell). Touched leaves, they fell off. Every leaf gone! Plant still in bloom, one stalk with 6 large blooms. Asks: will it survive without leaves? Chop spike for energy? Repot for moisture?

Expert Response

Katherine, if emergency repot used quality bark mix and pot with drainage, okay. If not, repot. Check roots for healthy firm roots; remove mushy before repotting. If not repotting, no water at least a week—large pots dry slower. Whether plant grows new leaves depends on growing point at leaf base—water may have stood there. Healthy roots but no new leaf if growing point destroyed. Cut old flower spike above node. If growing point destroyed, green spike may rescue plant—new plant may develop at node (clone), taking several months. Some hybrids don't maintain green spikes; they brown and die. Best hope: growing point still okay. Future: water early morning, use fan to dry moisture on leaves/tissues. Air movement helps dry above-pot parts.