Managing Overgrown Phalaenopsis Roots During Repotting

Cutting Moth Orchid Roots: When and How

Erin has a moth orchid with roots growing out of control—white, shriveled, with "joints" like elbows. Roots emerge from the pot's drainage holes. She asks how to care for them and whether to cut them, as it's time to repot.

Expert Response

Erin, orchid roots can develop joints and branch. Aerial roots may appear dry due to low humidity, developing scar tissue to seal against water loss. Good root care is vital for future growth—do not cut healthy roots. When unpotting, rinse roots and remove any mushy ones. During repotting, place as many roots as possible into the new pot. Some aerial roots may be too high; don't remove leaves to accommodate them. Use a plastic pot with many drainage holes, wet fresh orchid mix before use. Lower roots into the empty pot while slowly rotating it to minimize damage—roots follow the pot walls. Add mix, tapping the pot to settle it among roots. Soak roots briefly before repotting to reduce brittleness.