A CUT ABOVE THE BEST

Before and after of 1 of many trees we trimmed in this yard. Removed a lead and a few branches high up over the roof for clearance and a few lower branches over the yard to open the yard up and get a bit more sunlight. This was part of day 2 of a production job. Lots to climb and lots of ground work removing dead trees in the woods line and trimming back the lower stuff on the edge of the yard. I failed to take any more videos or pics than this because we just kept things moving. No lunch, almost no breaks. Git er’ done…..

MARK THE FEMALES NOW — PLAN THE TREATMENT FOR LATER

Right now, female tree-of-heaven trees are practically identifying themselves. The large, drooping clusters of pale green or yellow winged seeds—called samaras—show us which trees are female. These seeds mature later in the summer and may remain visible into winter. [1]

This is scouting season—not cutting season.

Here is what residents, neighborhood groups and city employees could be doing now:

Confirm that the tree is actually tree-of-heaven.

Photograph the leaves, seed clusters, trunk and surrounding sprouts.

Record the exact location, preferably with a map pin.

Note whether it appears to be on public or private property.

Estimate the trunk size and look for nearby suckers or additional stems.

Add confirmed female trees to a shared priority map.

“Marking” does not necessarily mean putting something physically on the tree. We should not paint trees, drive nails into them, or attach flagging on public property without permission. A photograph, a GPS pin, and a numbered map record may be all that is needed.

Why start with the females?

Female tree-of-heaven trees can produce more than 300,000 wind-dispersed seeds in a year. Massachusetts guidance specifically identifies targeting female trees as a practical way to reduce future seed production. That does not mean male trees are harmless—both sexes can spread through roots—but seed-bearing females are a sensible priority. [2][4]

What happens later?

The recommended treatment period is generally mid- to late summer through the onset of fall color, while the tree is still actively moving sugars and systemic herbicide toward its roots. “Treat them in the fall” should not mean waiting until the leaves have colored or dropped. [3]

And we should not simply cut down the identified trees. Cutting an untreated tree-of-heaven can trigger dozens of stump sprouts and root suckers. Where removal is necessary, guidance generally calls for treating the standing tree first, allowing time for the treatment to move into the root system and then removing it—with continued monitoring afterward. [2][3]

Treatment on public property should be planned by the responsible agency and performed by appropriately licensed professionals, in accordance with the pesticide label and Massachusetts requirements.

Could a town organize this?

A forward-looking city could establish a single reporting route, verify identifications, maintain a citywide map, prioritize female seed trees, schedule treatments at appropriate times, and require follow-up monitoring.

Could a town create a seasonal “Mark the Females” Tree-of-Heaven survey, perhaps through 311 or a simple online map, with coordination among Parks, Forestry, DPW, Conservation and qualified invasive-plant professionals?

Residents can provide much of the scouting information. The city could then turn that information into an organized management program instead of waiting until trees are cut accidentally or new colonies appear.

For now: find them, photograph them, map them—and mark the females.
Post them here with a good close-up and location data, and I'll add them to a map. Better yet, use iNaturalist to report them. I can map from there.

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Annotated references

[1] Massachusetts Department of Conservation and Recreation — “Tree of Heaven,” Citizen Forester, July 2020.
Useful Massachusetts identification sheet explaining that tree-of-heaven generally has separate male and female plants and that females produce clusters of twisted, winged samaras that ripen in late summer and may disperse through winter.
https://www.mass.gov/doc/citizen-forester-july-2020/download

[2] Massachusetts Department of Agricultural Resources — “Stop the Spread of Tree-of-Heaven.”
Massachusetts fact sheet describing female trees as prolific seed producers, established trees as root-suckering colony formers, and cut or injured trees as capable of producing numerous stump and root sprouts. It also stresses repeated follow-up and monitoring.
https://www.mass.gov/doc/tree-of-heaven-ailanthus-altissima-fact-sheet/download

[3] Penn State Extension — “Tree of Heaven: Control Strategies.”
Detailed management guidance explaining why systemic treatment must reach the roots, why cutting alone can worsen the infestation, and why the preferred treatment period is generally July through September or the onset of fall coloration. It recommends allowing approximately 30 days after treatment before cutting where removal is required.
https://extension.psu.edu/tree-of-heaven-control-strategies

[4] Massachusetts Department of Agricultural Resources — “Spotted Lanternfly Management Guide for Infested Areas.”
State guidance recognizing the removal of female tree-of-heaven as a cost-conscious priority because it prevents additional seed production. It also recommends experienced companies and licensed herbicide applicators for tree-of-heaven removal, particularly in difficult locations.
https://www.mass.gov/doc/spotted-lanternfly-management-guide-for-infested-areas/download