Some all-purpose grass seed products include a variety of seed types so they offer improved tolerance of the growing conditions you're likely to have. Other products include both grass seed and fertilizer to give growth a head start. Your particular yard and its sun/shade areas and soil types can dictate your choice of grass seed. That's why it's a good idea to make a note of the conditions before heading off to buy grass seed. Grass seed should be planted when soil preparation, moisture and your local temperature conditions are just right for seeds to germinate and grow. This will vary with different parts of Canada. Your garden centre experts will help you with this information.