“It can work its way down into the subsoil,” says Bauer, “so you will have to replenish it as you would organic mulch,” though not as often as arborist chips. Loose gravel rolls ...

Since wood chips are a great organic mulch ... Furthermore, if the OP lives in or near the Dallas area, Arborist USA noted that pecan, Texas redbud, escarpment live oak, and Mexican buckeye ...