• Most re-blooming daylilies are descendants of the yellow 'Stella D'Oro.'Flower image by Luke Haverkamp from Fotolia.com
  
  The daylily's scientific name, Hemerocallis, means "beauty for a day." Each blossom opens and dies within a day, and the older varieties of daylily bloomed for a month or less. The daylily's popularity soared in the early 1970s when Walter Jablonski developed the first reliable re-blooming daylily and named it Stella D'Oro, the star of gold. Since then, other growers developed re-blooming daylilies in a variety of colors and sizes, including the cheerfully yellow Happy Returns, a landscaping staple. Carefree and colorful, re-blooming daylilies belong in every summer garden.
  
  

Stephanie Returns

• A hardy everblooming daylily, Stephanie Returns starts flowering in early summer and continues until October, according to the Rutgers Agricultural Experiment Station. It is a smaller daylily with rosy petals, a plum eyezone, and a green throat.
  
  

Black-Eyed Stella

• Black-Eyed Stella won the All-American Award in 1994. The 3-inch flowers are golden yellow, tapering to a red eyezone and a bright yellow throat. The All-American Daylily Council reports that Black-Eyed Stella blooms from 100 to 297 days of the year. It is hardy in USDA zones 2 through 10, and the foliage is evergreen.
  
  

Lavender Vista

• Daylilies have many striking color combinations.Purple daylily image by Bluegill from Fotolia.com
  
  Lavender Vista blooms an average of 88 days. The petals are an even lavender with soft yellow stripes down the midline, leading to a yellow-green throat. This daylily grows nearly 2 feet tall, is more shade-tolerant than other varieties and grows in USDA zones 4 through 11. The flowers are 4 to 5 inches across and held slightly above the foliage.
  
  

Buttered Popcorn

• The tough Buttered Popcorn daylily sends its flower scapes well over 2 feet high. The large, 6-inch flower is a rich golden-yellow. Buttered Popcorn blooms from from 60 to 195 days, depending on the weather and soil conditions, and the All-American Daylily Council nicknamed it "Stella on Steroids."