When blooming season arrives my rose of sharon flower buds barely open only to turn yellow and die. What would a solution be for this problem?
Newt wrote:Hi Carolyn,
Bud drop can be caused by too much water, not enough water or too much fertilizer. If your ROS is planted in or near a lawn that gets fertilized regularly, that could be the cause. Take a look here.
There is also a flower blight that affects ROS. It's called Botrytis cinerea.
The site I recommended above recommends using Benomyl as a fungicide. I DO NOT recommend it's use. Take a look here as to why.
Take a look here for an environmentally friendly solution.