What could be causing leaves to turn slightly yellow? Used Epsom salt earlier in the season. Any other suggestions?
Certified GKH Gardening Expert
If the weather is beginning to turn cooler in your area, this could be the cause. Plumeria naturally goes dormant during winters, even in quite warm regions, and its leaves will gradually yellow and fall off.
Other possible causes include overwatering or poorly-draining soil in its pot, or a mild infestation of spider mites: