Why Do Rhododendrons Turn Yellow?

If your soil is alkaline, you've found one reason for rhododendron leaves turning yellow: a mineral deficiency causing chlorosis. These shrubs take up too much calcium and not enough iron in alkaline soils. Chlorosis is very likely when the yellowing is mostly between the veins of new leaves.

How do you revive a rhododendron?

Can a yellowing plant be saved?

Leaves often turn light yellow and fall off if the plant is exposed to cold temperatures or a draft. ... There isn't much you can do about the leaf damage once it happens, but you can remedy the problem by sheltering the plant from drafts and keeping it at its preferred temperature range.