Whenever I’m asked for an extremely low maintenance plant, Dwarf Yaupon Holly or “Schillings” come to mind. These holly plants have very small leaves which are reminiscent of boxwood and often are mistaken for boxwood plants.
They a slow growing plants that have a somewhat naturally rounded shape to them and are easy to maintain in that shape, if desired. They are not a holly that berries however. They can grow 3-4 foot high and wide over time but can be kept more in the 2-3 foot range with occasional trimming.
They are very salt tolerant, drought tolerant and deer rarely will touch them- all of which makes for a plant that is very easy to care for and always looks good.