Thank you for your question!

Unfortunately, Siberian elm trees are notorious for producing extremely heavy seed crops during mast years, and the resulting cleanup can be overwhelming for neighboring properties. The seeds can accumulate in gutters, landscape beds, and lawns, while also producing large numbers of volunteer seedlings.

Siberian elm is also considered an invasive and somewhat problematic tree throughout much of the Midwest because it spreads aggressively by seed and often becomes weak and brittle with age. As these trees mature, they can become more susceptible to limb breakage and storm damage.

In terms of possible next steps:

1. Start with a conversation with the neighbor. A friendly discussion is often the best first approach, particularly if a substantial portion of the canopy extends over your property and the cleanup burden has become excessive.

2. Document the impacts. Photos of seed buildup, clogged gutters, seedlings, overhanging limbs, or any property damage may be helpful if concerns continue.

3. Consider consulting a certified arborist. An arborist can evaluate the tree’s overall health and structural condition, determine whether pruning may help reduce some of the issues, and assess whether removal may be justified due to risk, decline, or invasiveness. Keep in mind that pruning alone usually will not eliminate the seed problem on a large mature Siberian elm.

4. Review local regulations regarding overhanging branches. In many areas, homeowners are permitted to trim branches back to the property line, provided the work does not damage the overall health or stability of the tree. Because ordinances vary, it is a good idea to check local city regulations before proceeding with major pruning.

5. For volunteer seedlings, hand-pulling while they are young is usually the most effective approach. Mulch can also help suppress germination, and repeated mowing or trimming will often exhaust seedlings over time.

I hope this information is helpful!

Best,

Victoria

University of Minnesota Extension Master Gardener