Please tell me when to prune and about general care of Japanese Hydrangeas.
These articles should help: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/prune-hydrangea-bushes-hydrangea-pruning-instructions.htm
Our hydrangea has been infested with some type of insect pest. It is manifested by leaving a white oily feeling mound, which on close inspection appears to have produced a beetle type bug which is the same color as the bark so extremely difficult to see. I have tried a variety of treatments, which seem to have killed them but the infestation still appears to be spreading to other hydrangeas in close proximity. The beetle is only about three sixteenths inches long. Is this the Japanese beetle I have heard about? Your advice would be much appreciated.
Treat the shrub with neem oil. It is effective on many types of insect pests and is safe to use. Here is more info: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
I'd like to transplant the following bushes from my front side yard to my backyard. Holly bush, Japanese hydrangea, maybe burning bush. They were all planted 4 years ago. They are over growing in to each other. Thank you for any advice.
Gee, this is the perfect time to transplant. Weather is still decent, and the plants are going dormant. Just make sure you get a large rootball and water heavily!