Croton Leaf Decay
Hello! I have a croton that is a couple years old and was recently repotted into a brand new pot. Although it has plenty of new growth, some leaves are developing a grey spot on them which eventually decays. What is causing the decaying spots and how can I fix it?
Dakota County Minnesota
Crotons are amazing plants that are a joy to behold with all their colors. The left-most picture that you sent appears to show a leaf near the bottom of the plant. This would be one of the oldest leaf on your plant. The discoloration that you are seeing may be a result of simple senescence or some type of bacterial/viral infection due to excessive watering. Crotons do not need a lot of water. Too much water can lead to moisture on the lower leaves that, in turn, can promote bacterial and viral infestation.
For the time being, I would just remove the leaves showing these discolorations. As long as the rest of the plant is looking good and showing new growth, I would not be especially concerned.
Here are a few sites involving Crotons.