Black ash trees grow in swampy areas and are an important natural resource for First Nations communities. White ash are often planted in cities and are probably the most recognizable of the species.

Hamilton's first infestation was reported in 2009. Hamilton is home to 23,000 ash trees along city streets and in municipal parks and cemeteries — about 8 per cent of the city's canopy.

Ash trees are typically between 50 and 80 feet tall, and there are a few different varieties including the white ash tree, green ash tree, and black ash tree. Most of them have five to nine leaves ...