This cultivar has horizontally spreading branches if it is grafted at ground height. If grafted on a stem, the branches hang down somewhat. This creates a fairly flat parasol shape. As a result, it does not take on a truly weeping character. 'Horizontalis' is often confused with the cultivar 'Pendula' which has more hanging branches. The tree grows slowly, rendering it suitable for small gardens, as well. The fan-shaped leaves grow in bundles of 3 - 5 together and have an incised top. 'Horizontalis' is generally not as brilliantly coloured in the autumn. It requires a site with ample light and tolerates heat well. Winter hardiness zone: 5a