One of the most interesting facts about sycamore trees is that they have the largest trunks (by diameter) of all American hardwood trees. The sycamore tree is broad and round and its trunk is normally three to four feet in diameter, but some trees have trunks that span up to 10 feet across. They are also one of the tallest hardwood trees, usually growing to 80 to 100 feet.
Sycamore trees thrive in places that have a climate range of 40 to 70 degrees Fahrenheit and are typically found east of the Great Plains. A deciduous tree, the sycamore tree is not drought-tolerant and needs to be planted in areas with a lot of moisture, such as deep riverbanks, lakes and streams. Its palmate leaves have three or five lobes with wide, large-toothed edges and are bright green at the top and pale green on the underside. North American sycamore trees shed their leaves in the fall, but can still be recognized without their leaves by their smooth, whitish bark. Its fruit, called achenes, is dry, hairy and light enough to be carried by the wind and help grow trees in new places. Its hairy exterior, however, can cause skin allergies and respiratory problems in some people.