I bought two new hibiscus plants after ours died from the cold last winter. The hibiscus tree has me baffled as it seems to have bugs, aphids, etc. I tried a rose powder to it and it has not helped. The other hibiscus has buds on it that are empty. We have had hibiscus before and have never had this problem. Can you help? I don't know what to do for it.
Hibiscus Bugs, Empty Blooms
Certified GKH Gardening Expert
Gall midge may be affecting your hibiscus flowers if the buds won't open. This insect lays its eggs inside the buds. These must be controlled with an appropriate insecticide targeted at these pests. To find out if gall midge is to blame, examine the buds for signs of midge larvae by cutting or pulling them apart.
Here is an article on aphid control that you may find helpful: https://www.gardeningknowhow.com/plant-problems/pests/homemade-aphid-control-a-natural-way-to-kill-aphids.htm