Does anyone know how to fix this problem. This Hibiscus

had beautiful colored leaves when planted. We had awful freezes last year for Houston. Is this related. I had to cut it this hibiscus back to the root, but it did survive.

I have planted another in another location and it has beautiful leaves at this time.

Is there any fix for this. I had heard you could buy special plant food. Another site said to pull all the leaves off and it might revert.

Thanks in advance for any help. Caroltropicals