Moth orchid: dropping leaves
An orchid dropping more than its oldest leaf has a root problem. Slide it out of the pot and look — healthy roots are firm and green or silver, dead ones are brown, flat and hollow.
Working through the causes
Start with the first one — on moth orchid specifically, that's the most likely explanation. Each entry below names the observable that separates it from the others.
Relocation or environment change most common
How to tell: Started within days of coming home from the shop, being moved to another room, or the heating coming on.
What to do: Pick a spot and leave it there. Most plants stop dropping within three weeks once conditions are stable. Figs and crotons are the worst offenders and the slowest to settle.
Overwatering common
How to tell: Leaves yellow before they fall, soil is persistently damp, drop starts from the bottom.
What to do: Let the soil dry down and check drainage.
Cold draft seasonal
How to tell: Drop concentrated on the side facing a door, a window, or an air vent, often after a cold night.
What to do: Move it away from the draft. Cold air pouring off winter window glass is enough on its own.
Severe drought common
How to tell: Leaves go crisp and brown before falling, and the pot is very light.
What to do: Rehydrate by bottom-watering, then keep to a consistent schedule.
Plantroster keeps every photo and every diagnosis for a plant, so "sun-scorched" becoming "sun-scorched and mite-infested" three days later is visible instead of lost.
Track this plantQuestions people ask
Should I cut off the affected leaves?
Damaged tissue never turns green again, so removing it is cosmetic — do it if it bothers you, using clean scissors. What matters is whether NEW growth comes in clean. That's your read on whether the fix worked, not the old leaves.
How long until I know it's working?
Give it two to three weeks. Existing damage won't reverse, so you're watching the newest leaves. If those still come in affected after three weeks, the cause you treated wasn't the cause.
More on moth orchid
General horticultural guidance based on visible symptoms. A photo or a description can't rule everything out — when a plant matters to you, check the roots before acting.