Asiatic lilies are a viable choice for many northern gardens since they are hardier than other lily varieties, often to USDA plant hardiness zone 3. Typically, lilies are planted in the fall, but if your Canadian climate is colder than the lily's rated hardiness zone, plant the bulbs in the spring when the ground is workable. Then, if you want to plant them again the next year, dig the bulbs up in the fall after the foliage withers to store them indoors during the winter.
Choose a location to plant your Asiatic lilies. It should be in full sun, or possibly an area with a little bit of shade but that still receives at least six to eight hours of sunlight a day. The area should not puddle with water after it rains.
Till the top foot of soil with a rototiller, garden rake or hoe. Incorporate about 4 to 6 inches of equal amounts of compost and sand to soil that is high in clay, or about 4 inches of compost to sandy soils.
Plant Asiatic lilies with the bulb tips facing up. The bottom of the bulb should be three times as deep as the bulb is in width. For example, if the bulb is 2 inches wide, the base should sit 6 inches below the soil's surface. Space multiple bulbs about 6 inches apart, but adhere to the spacing instructions on the label; each Asiatic variety is slightly different.
Cover the area with about 4 to 6 inches of organic mulch (for example straw or wood chips) just as the ground begins to freeze, usually in the early fall for much of Canada. Remove the mulch in the spring when new shoots appear.