Please help my hisbiscus!
I planted a row of them on a slope, they've been doing fine for over a year now. Then the last couple months, they started dying. I can't insert photos within this post, so I'll post the links to the photos below. Among the photos, you'll see a pix of when they were healthy (green leaves and giving me pretty flowers), other photos will show branches with no leaves, looking emaciated. Another pix shows the root system after I pulled the plant from the ground. Couple other photos show the inside of the branches, it's still green inside. The soil is still moist, so I don't think they died from being too dry. Any input as to why this happened is very much appreciated. I'm about to give up on hibiscus and select another variety to occupy the top of my slope. I'm in central California, where it's very hot in the summer and very cold in the winter, nothing that hibiscus can't handle. So I'm puzzled this happened. Also, there are some weeds/grasses around the plants, can they be sucking nutrients away from the hibiscus plants? Thank you!