Be prepared for a lot of work if you want to have a bed of cannas in Minnesota! I keep going each year because these tropical plants produce tall stalks of foliage with magnificent cardinal red flowers which are a favorite of hummingbirds. Between June 1 and June 15, I plant the bulbs in the soil with a few inches of dirt or mulch covering the bulbs. Light soit with peat, for example, is best because black dirt alone can make the bulbs simply too heavy to remove in the fall. After the first frost, I cut the stalks back to about 3 inches above the soil. I dig out the bulbs in a whole clump with most of the soil removed and place them in plastic bins containing vermiculite or wood chips in my basement. The large clumps of bulbs grow the tallest and first the next year. I found separating the bulbs leave me with bulbs that produce short plants with smaller flowers during the short Minnesota growing season!