Start with normal ageing
Older inner leaves may yellow and fall naturally. A rapid change across young growth is more concerning.
Nenrin · Care system
Yellow leaves on bonsai
Distinguish old from young leaves, uniform yellowing from green veins, and isolated leaves from a whole-crown change before choosing an action.
01 / Method
Yellow is a pattern, not one cause.
A weakened tree usually needs stable light, correct moisture and time—not simultaneous pruning, feeding and repotting.
Inspect water and roots
Both drought and oxygen-starved roots reduce uptake. Do not add fertiliser until root-zone moisture and drainage are understood.
Consider pH, nutrients and pests
Interveinal chlorosis can involve availability or root function. Inspect leaf undersides and review water quality before correcting nutrients.
02 / Triage
Safe sequence
Check the species and season.
Read moisture below the surface.
Stabilise light, temperature and wind.
Change one variable, then observe.
Nenrin