Have in my yard in central Florida better color in warm weather, this is what it looks like today. about 2-3 ft tall.
If you have sandy soil maybe there is a nutrient the box needs that has been leached out, otherwise perhaps a pest on the roots. Could be a problem that is often seen with these in your area, ask as trusted independent garden center, Master Gardener clinic or Florida Cooperative Extension office. Clip and take a representative piece of the shrub.
