9 Fastest growing trees: 1 Empress Tree. It grows 10-15 feet per year. 2 Willow Tree: 6-12 fpy. 3 Lombardy Poplar. Grows 8-10 fpy. 4 Eucalyptus tree grows 6-8 fpy 5 American Sycamore grows 6 fpy. 6 Quaking Aspen grow about 5 fpy. 7 Muskogee Crape Myrtle grows 4-5 fpy. 8. October Maple grows 3-5 feet per year. 9. Autumn Purple Ash grows 3-5 feet p y.

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9 Fastest growing trees: 1 Empress Tree. It grows 10-15 feet per year. 2 Willow Tree: 6-12 fpy. 3 Lombardy Poplar. Grows 8-10 fpy. 4 Eucalyptus tree grows 6-8 fpy 5 American Sycamore grows 6 fpy. 6 Quaking Aspen grow about 5 fpy. 7 Muskogee Crape Myrtle grows 4-5 fpy. 8. October Maple grows 3-5 feet per year. 9. Autumn Purple Ash grows 3-5 feet p y.