What is causing my Abelia bushes to lose their leaves?

Question

These plants are 7 years old. Something is causing the leaves to fall off.

Answer 1

Plants can lose leaves for a number of reasons such as disease, pests and environmental issues. If you are unsure which it is, then try treating the plant with a fungicide, a pesticide and double check that it is getting all the water and nutrients it needs. I personally like to treat plants with neem oil as it is organic and is both a fungicide and a pesticide.

This article may also help too:
https://www.gardeningknowhow.com/garden-how-to/info/plant-dropping-leaves.htm