Landscape Ontario
http://www.landscapeontario.com
Landscape Ontario is your ultimate source for relevant local information on anything to do with the landscaping / gardening industry. If you are looking to hire a landscaping professional, need more information on your hardiness zone, want to learn how to design your own garden or just love gardening and want to read up on the latest news, then this is the site for you.
Tree Atlas
http://ontario.ca/treeatlas
As part of Ontario's "Plant a Tree Challenge," Landscape Ontario and the Ministry of Natural Resources have created an online Tree Atlas with an interactive map as a resource for providing information on Ontario native trees.
Identifying Insects, Spiders & Their Kin
http://bugguide.net/
The Bug Guide is an online encyclopedia of images, detailed identification and information on insects, spiders and their kin in both Canada and the United States. Users can search the existing database or submit their own images for identification. This is a great resource for determining whether the bug is beneficial or harmful before you spray.
Weed Info Canada
http://www.weedinfo.ca/
The Canadian weed index is now available online courtesy of the Ontario Ministry of Agriculture, Food and Rural Affairs. You can search for weeds by common name, botanical name or Bayer code. If you don't know the name of the weed you can also perform a search using descriptive terms such as colour. With lots of information and tools all aimed at allowing you to make informed risk-reducing weed control decisions the weed info site is a fantastic resource.
Oshawa Garden Club
http://www.oshawagardenclub.ca/
The Oshawa Garden club has a membership of over 300 local individuals who are passionate about the environment and beautifying the community. They are always looking for new members from the community interested in attending club meetings, going on organized trips and enjoying other social opportunities with fellow gardeners.