As you’re planning your summer flower gardens, be sure to leave some room for summer bulbs. Summer bulbs include canna lilies, dahlias, Asiatic and Oriental lilies, gladiolus and tuberous begonias. Asiatic lilies are hardy to Zone 3. They are the hardiest of all the lily hybrids. Once they are established in your garden, they will produce showy blooms for many years. Cannas do well in garden beds and containers.