Croton yellow leaves

A healthy croton may have bold yellow areas as part of its cultivar’s coloring. Look for loss of firmness, a whole leaf fading, or repeated leaf drop to distinguish damage from variegation.

When leaves are actually declining

Check the root ball and recent cold or light changes. Rehydrate dry mix evenly, or empty runoff if it is wet. Give strong light with gradual acclimation to direct sun.

Inspect undersides for mites and stems for scale if leaves look dusty or sticky. Continued yellowing with soft bases or wilt over wet soil calls for a root inspection.