Boxelder

Problem Species

Upper Midwest

308 cities

Boxelder (Acer negundo) is the only maple native to North America that has compound leaves, which throws a lot of people off because it looks nothing like a maple at first glance. The leaves are divided into 3 to 5 leaflets and look more like poison ivy or ash than the maple leaf on a Canadian flag. It grows fast, shows up in disturbed soil, fence lines, and riverbanks without being planted, and is widely considered a weed tree in the Upper Midwest.

Lifespan

60 to 75 years under good conditions, though many urban specimens decline significantly by 40 to 50 years due to storm damage, disease, and structural failure.

Mature Size

Typically 35 to 50 feet tall with a spread of 30 to 50 feet, though growth is irregular and the form is often ragged rather than symmetrical.

⚠ Problem Species

Why it's a problem: Weak, short-lived, harbors boxelder bugs

Care & Maintenance

Boxelder grows in almost any condition, which is part of the problem. It tolerates wet soil, drought, poor drainage, and compacted urban soil, but that adaptability doesn't translate to structural strength. Fertilizing it is largely a waste of time and money. If you have one you're trying to keep alive, deep watering during drought is about the extent of meaningful intervention.

Common Issues & Threats

Boxelder bugs (Boisea trivittata): These red-and-black insects don't hurt the tree, but female boxelders attract massive populations that invade your home in fall looking for winter shelter. The tree is their primary host, so if you're fighting boxelder bugs on your house, the tree is the source.
Weak branch unions: Boxelder forms tight, V-shaped branch attachments that are structurally poor. Large limbs fail without much warning, especially in ice storms or high wind. If it's near your house, driveway, or a play area, that's a real liability.
Verticillium wilt: This soil-borne fungal disease causes sudden branch dieback and can kill sections of the tree quickly. You'll see wilting, yellowing leaves, and if you cut into the wood you may see dark streaking. There's no cure, only management by removing affected limbs.

Pruning Guide

Prune in late winter before bud break, which reduces the risk of attracting the beetles and borers that are drawn to fresh wounds in warm weather. Focus on removing co-dominant stems and tight V-crotches early, while the wood is still small enough to manage. Here's what most people get wrong: they let boxelder grow unpruned for a decade, then try to correct the structure when the limbs are already large and the bad unions are locked in.

Did You Know?

Boxelder sap ferments and was historically used by some Native American groups to make a mild sugar syrup, though the sugar content is much lower than sugar maple. It's also the only maple in North America that is typically dioecious, meaning individual trees are either male or female. Only the female trees produce seeds, and only the female trees attract boxelder bugs, so if you're planting one for some reason, a male tree won't bring the bugs.

Where Boxelder Is Found

Boxelder is common in 308 of the US communities we cover, across 1 climate regions.

Hardiness Zones 2-8

Eden Prairie, MN Zone 5a Oak Park, IL Zone 6a Wheaton, IL Zone 5b Minnetonka, MN Zone 5a Edina, MN Zone 5a Downers Grove, IL Zone 5b Chesterfield, MO Zone 6b Dublin, OH Zone 6b Glenview, IL Zone 6a Elmhurst, IL Zone 6a Park Ridge, IL Zone 6a Upper Arlington, OH Zone 6b

... and 296 more cities

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