Best daylily cultivars by bloom time and color

Daylilies grow along roadsides, under power lines, and in abandoned lots across the eastern US -- which tells you something real about their cultural tolerances. The orange roadside daylily (*Hemerocallis fulva*, the common tawny daylily) is essentially indestructible. Named cultivars, particularly.

Daylilies grow along roadsides, under power lines, and in abandoned lots across the eastern US — which tells you something real about their cultural tolerances. The orange roadside daylily (Hemerocallis fulva, the common tawny daylily) is essentially indestructible. Named cultivars, particularly modern tetraploid hybrids, are considerably more finicky — they need more sun, better drainage, and more maintenance than the roadside plant that gave the genus its reputation for toughness.

I don't grow daylilies at my Long Island house. The deer would eat every bloom. This guide draws on American Hemerocallis Society records and Extension evaluations.

Understanding daylily classification

Per NC State Extension:

• Diploid: normal chromosome count; typically more adaptable, more self-sufficient
• Tetraploid: doubled chromosome count; larger flowers, heavier petals, better branching; more demanding about soil drainage and full sun
• Dormant: foliage dies completely in fall; hardiest type (to zone 3); best for northern gardens
• Evergreen: foliage remains green year-round; best for zone 7+ but can die back in zone 5 cold
• Semi-evergreen: intermediate behavior; adapts to zones 4—9

Per Missouri Botanical Garden, for northern gardens (zones 3—5), dormant varieties are the most reliable choice. Evergreen varieties often fail to establish properly in zones below 6 because they need mild winters to cycle correctly.