Yellow leaves on your bonsai
Yellowing is the most common distress signal — and almost always about water or light. Here's how to tell which one it is.
Likely causes
Overwatering (most common)
How to tell: Soil stays wet for days, leaves yellow from the bottom up and may feel soft. The roots are suffocating.
The fix: Let the top of the soil dry before watering again, check the pot drains freely, and in bad cases repot into fresh, gritty bonsai soil.
Underwatering
How to tell: Soil is bone dry, leaves go yellow then crisp, and the whole tree looks limp.
The fix: Soak the pot until water runs from the holes, then water whenever the surface feels just-dry — by feel, never on a fixed schedule.
Too little light, or normal autumn colour
How to tell: An indoor tree sitting far from a window, or a deciduous tree yellowing in autumn.
The fix: Move it to the brightest spot the species tolerates. If it's autumn on a deciduous species, the yellowing is natural — let it happen.
How to prevent it
Water by feel rather than by calendar, and match the light to what the species wants.
Common questions
Should I remove the yellow leaves?
You can pick off fully yellow leaves, but fix the underlying cause first — removing leaves doesn't cure the problem.
Is a few yellow leaves normal?
A leaf or two is fine — trees shed old foliage. Widespread yellowing is a warning worth acting on.
General guidance based on 20+ years of practice. Every tree is different — when in doubt, ask us.