European buckthorn – Rhamnus carthartica

What is it? The European buckthorn, common buckthorn, or just buckthorn, is an invasive flowering tree native to Europe that was introduced in the 1880s to Canada, and has since spread across the country, becoming widespread throughout eastern Canada by the 1900s. They remain common across Ontario, having been naturalized in many regions and areContinue reading “European buckthorn – Rhamnus carthartica”

Dog Strangling Vine – Cynanchum rossicum  (formerly Vincetoxicum rossicum) 

What is it?  Dog strangling vine, also known as European swallowwort, pale swallowwort or just swallowwort is a perennial non-woody flowering plant, native to southeastern Europe and Asia, and introduced to North America in the 1800s for gardening but which has since become invasive.  Contrary to its menacing name, this vine like plant cannot strangle man’s best friend but its rapid spread across southern Ontario and parts ofContinue reading “Dog Strangling Vine – Cynanchum rossicum  (formerly Vincetoxicum rossicum) “