how tall is a japanese maple
1 Each leaf has five to nine lobes. 2  Linearilobum group: This group has a long and slender lobe with five to seven lobed leaves.  Most Japanese maples will grow to around 5 meters (16.4 ft) in height and end up with a broad, vase-like crown. The main trunk is usually about 1 meter (3.3 ft) in height and strong.