About
Hemerocallis thunbergii, the late yellow daylily, is a deciduous herbaceous perennial to around 120 cm with clumps of arching, strap-like, green leaves. Lemon-yellow, slightly narrow flowers are produced on tall scapes in summer � notably late-flowering compared to most species. An elegant and ornamental species daylily.
About the genus
Hemerocallis, the daylilies, are evergreen or herbaceous perennials with narrow, strap-shaped leaves and funnel-shaped flowers on branched scapes in late spring and summer. Each flower lasts only a single day, but is replaced by a succession of new blooms. Among the most versatile and rewarding of all border perennials.
Growing conditions
SunlightFull sun, Partial shade
Soil typeChalk, Clay, Loam, Sand
Soil pHAcid, Alkaline, Neutral
Soil moistureMoist but well-drained
AspectSouth-facing, West-facing
ExposureExposed, Sheltered
UK hardinessH6
Plant details
Plant typeHerbaceous Perennial
HabitClump forming
FoliageDeciduous
Height1-1.5 metres
Spread0.5-1 metres
Time to full height2-5 years
Suggested usesCoastal, Cottage and informal garden
Native toChina Korea
ToxicityTOXIC to pets (cats) - see the HTA guide to potentially harmful plants for further information and useful contact numbers
Care notes
CultivationGrow in fertile, moist but well-drained soil preferably in full sun. Flowering is likely to be poor in shadier situations. Tolerant of heavy clay and poorer soils. May need watering in spring to early summer in dry conditions to ensure flowering. See Hemerocallis cultivation or daylily cultivation for details
PruningCut back flower stems after flowering has finished. Remove dead foliage as required
PropagationPropagate by division in early spring or early autumn
Pest resistanceMay be susceptible to aphids, slugs, snails, hemerocallis gall midge, glasshouse red spider mite and Thrips
Disease resistanceMay be susceptible to fungal leaf spot and rust diseases or bacterial leaf and stem rot