Here's another article from CBC that has some helpful information about the does and don't of bee-friendly gardens.
http://www.cbc.ca/news/canada/manitoba/plants-help-bee-pollinators-1.4039907
"Pearce said supporting pollinators isn't just about flowers and pollen — it requires plants that have good leaf litter, places for pollinators to winter and food sources for young insects.
She said pollinators include more than honey bees and that supporting wasps, moths, butterflies and even some birds is important.
[...]
Pearce said that people can help bees in their own gardens and yards by minimizing pesticide use. She also recommends planting things that are local, good pollen producers and that flower throughout the season.
She also encourages people to leave dandelions up for a bit in the early spring, as they are the first point of pollination for many insects. She says plucking them by hand before they seed is the best way to get rid of them after they've been useful."