Invasive Species Here are some invasive species in Ottawa that you may find in your garden. Be on the lookout for these: This is known as Common Buckthorn or Rhamnus cathartica. Don’t be fooled by a lack of berries as only the female plants have them. Wild Parsnip, can look like Queen’s Anne’s Lace but has yellow flowers, is more robust and can be taller. Often seen growing along roadways. Its milky fluid can cause severe rashes. Dog Strangling Vine en masse Dog Strangling Vine seed pods. The seed pods are narrower but look similar to Milkweed pods.