Species profile
American Valley Forge Elm
Ulmus americana
2,311 on Toronto's streets — 0.34% of the city's catalogued canopy.
🍁 Fall colour Oct 1 – Oct 20: golden yellow, Dutch-elm survivors
Toronto history — American elm — was the defining tree of Toronto's streets a century ago. Dutch elm disease killed most of them in the 1960s-70s. Current survivors are kept alive with periodic fungicide injections; the 'Valley Forge' cultivar is newly-planted for disease resistance.
Ulmus americana, generally known as the American elm or, less commonly, as the white elm or water elm, is a species of elm native to eastern North America. The trees can live for several hundred years. It is a very hardy species that can withstand low winter temperatures. The American elm was once exceptionally common as a street tree, its tolerance of urban conditions making it a popular choice t
Planting profile (from the City of Toronto)
| Native to | Native to Ontario |
| Mature size | Large, 20m high by 18m wide |
| Growth rate | Fast |
| Sensitivity | Very Hardy |
| Best site | Lawns and boulevards |
| Plants under overhead wires | No |
Where they cluster
| Neighbourhood | Trees |
|---|---|
| Bridle Path-Sunnybrook-York Mills | 125 |
| Rosedale-Moore Park | 82 |
| St.Andrew-Windfields | 74 |
| Forest Hill South | 63 |
| Wychwood | 59 |
| Banbury-Don Mills | 49 |
| Brookhaven-Amesbury | 47 |
| High Park-Swansea | 46 |