Question
I have a rose of Sharon tree with lots of moss growing on it. Can I pull it off without doing harm? What should I use to control not having moss?
Connie

Answer
Connie:
These growths are probably lichens. They are not considered disease organisms.  They are a collection of a fungus and an algae growing in a symbiotic relationship. They can also grow on rocks,fence posts,etc. Usually found on older or stressed plants. Can be rubbed off,but will return.