Box elder (Acer negundo), sometimes called boxelder, is a type of maple tree commonly found growing in moist areas near streams and rivers. Box elder is a deciduous tree with pinnate compound leaves (small leaflets that branch out of a single stem). The leaves turn yellow in the fall. Clusters of small flowers appear in spring. The flowers on female trees develop winged fruits called samaras. The flowers attract pollinators and the seeds provide food for birds and small mammals.

Box elder is an attractive tree that provides shade and visual interest in the landscape. Some gardeners prefer male box elders because they are less messy than female trees. Gardeners should also be aware that this tree sends out suckers which can become weedy and invasive. This fast-growing tree needs a large planting area as it can reach over 50 ft tall - and nearly as wide - when mature. It also requires a moderate to high level of moisture, including weekly supplemental irrigation in summer.

Box elder gets its name from its wood, which is used to make boxes and crates. The wood pulp is used in paper making. Like other maples, the tree's sweet sap can be cooked into a syrup.