Q.Hibiscus Help??
My plants are on the west side of our home. They are kind of “leggy”, with little green foliage and they look bare. Do they need more fertilizer?

Certified GKH Gardening Expert
I don't know how much fertilizer you've given them, but here are tips on how to fertilize.
I'm also including an article about leaf drop on hibiscus. Yours may be responding to a stressor like too much or too little water, improper fertilization, transplant shock, etc.
https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/hibiscus-leaf-drop.htm
https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/hibiscus-fertilizing.htm