Battling invasive species...

You might be interested in checking this out from the Nature Conservancy of Canada if you're in the midst of planning your gardening for this season.

Studies around the world show that in many cases where invasive alien species have not been controlled, native plants and animals are entirely eliminated from a region and the economic costs of trying to control and re-establish native populations are extremely prohibitive.

There are a lot of advantages to promoting native/indigenous plants.

Here's a list of wildflowers that are native to Ontario.