The height of Japanese Dwarf Red Maples ranges from 4 feet to 8 feet depending on the species. Some Red Dwarf Maples grow wider rather than taller.
The Dissectum Atropurpureum is a classic Japanese Dwarf Red Maple with feather-like red leaves. They grow to 8 feet tall and wide. Green Cascade is a Dwarf Red Maple variety that has deep green foliage and leaves that turn a deep red and weep in the fall. It grows low and wide in shaded, moist soil. A Caperci Dwarf Red Maple is a slow growing variety with leaves that start off pink before deepening into a red. It grows to about 6 feet tall and 10 feet wide. The Coonara Pygmy Dwarf Maple grows to 8 feet tall and wide and features leaves that have an early pink tinge but change to a fiery orange-red in the fall.
Japanese Dwarf Red Maples need warm temperatures to grow and do best in zones six through eight. They can grow in more tropical climates, but need protection from the sun to prevent their leaves from scorching. In colder temperatures, the maples need protection and insulation from the winter weather, and gardeners may want to consider cultivating them in pots they can bring inside for the winter.
Since the plants have shallow roots, they need frequent watering. Consider setting up an automatic watering system if possible. Pruning the tree regularly will help to control its size.