Cherry trees are perfectly at home in Ontario's climate. Most cherry varieties are hardy to USDA growing zones 3 and lower, and they prefer slightly acidic soil, which Ontario has an abundance of. But since springtime can be frosty, consider planting a cherry tree seedling instead of seeds. All they'll need to thrive is full sunlight, well-drained soil and regular feedings. And in a few years you'll have more cherries than you know what to do with.
Dig a hole that is three times the circumference and three times the depth of the container that your cherry tree sapling is currently in.
Fill the hole with water and allow it to drain.
Mix half of the excavated soil with aged compost.
Carefully remove the cherry tree sapling from its container. Check the root ball for any damaged roots. Prune any that you find with a pair of disinfected pruning shears.
Place the cherry tree sapling into the hole so that the top of its root crown is an inch or so above the surrounding soil. You will have to back fill the hole with some of your soil mixture to accomplish this.
Fill the hole with the remainder of your soil mixture. Then tamp down the soil with your hands to remove any air pockets.
Water the planted sapling so that the soil is moist to the depth of the bottom of the root ball. The best way to do this is to turn the hose on to a slow trickle and leave it near the base of the tree.
Spread a 4 inch layer of organic mulch around, but not within 1 foot of, the cherry tree's trunk.