Ask Mr. Smarty Plants

From our Native Plant Database, Malpighia glabra (Acerola) which is also known as wild crapemyrtle or Barbados Cherry, the Growing Conditions are listed this way:

"Growing Conditions

Water Use: Medium
Light Requirement: Part Shade
Soil Moisture: Dry
Soil Description: Sandy, Sandy Loam, Medium Loam, Clay Loam, Clay
Conditions Comments: Half of the winters in the Austin area are mild enough for Barbados cherry to keep its leaves. It is useful as a dense screening hedge that may be left soft, sheared, or as a specimen. Birds quickly gobble up its bright, edible fruit and adult butterflies feed on the nectar. Standard tall and dwarf spreading varieties exist."

It would appear to us that you have an ideal situation for this plant; although you might need to shade it a little bit from the summer sun. Most rose beds are placed in full sun, and this plant is something of an understory tree and needs at least a little shade. Native plants placed in the proper soil and conditions need very little pampering. If you are determined to do something for it, you might work a little compost into the soil. We usually suggest incorporating compost to help with drainage in a clay soil, but it will also help to keep a loose, sandy soil from draining too much.