(Daylily) This popular, easy to grow perennial is great for the novice as well as the experienced gardener. Hemerocallis 'Happy Returns' has a 3 inch large, fragrant, canary yellow flower with slightly crimped edges. The beautiful yellow blooms are produced in early summer and will rebloom until frost. 'Happy Returns' has extended bloom flowers that last at least 16 hours each on heat tolerant, deep green foliage.