Hemerocallis Big Time Happy is the database-clean form of the accepted cultivar Hemerocallis 'Big Time Happy'. It is a Deciduous herbaceous Asphodelaceae Perennial that forms clumps of arching, strap-shaped leaves. Fragrant single lemon-Yellow flowers have Green to green-Yellow throats. The American Daylily Society records 10.16-cm blooms on 45.72-cm scapes, Diploid ploidy, Dormant foliage, an extended flower-opening habit, extra-early bloom, and rebloom.
The RHS records an ultimate height of 50-100 cm and spread of 10-50 cm in two to five years. Grow in Full sun or Partial shade in fertile, Moist but Well Drained Chalk, Clay, Loam, or Sand at Acid, Neutral, or Alkaline pH. South- or West-facing sites may be exposed or sheltered. Water during dry conditions from spring to early summer to support flowering.
Chicago Botanic Garden records USDA zones 2-9 and bloom categories from May through October. Divide in early spring or early autumn. Cut back spent flower stems and remove dead foliage as needed. Big Time Happy suits coastal gardens, informal borders, bedding, and groundcover. All fruit fields remain blank because no qualifying exact-cultivar source documents consumer fruit traits. The plant is toxic to cats.