Hemerocallis 'Killer'

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daylily 'Killer'

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Herbaceous Perennial

An upright, clump-forming perennial to 70cm high, with semi-evergreen, strap-shaped foliage. Large, triangular flowers to 15cm across are borne in summer on branching stems, with deep violet purple, recurved petals with lightly frilly edges, a black eye zone and lime green throats

Position

Full sun

Soil Types

Chalk, Clay, Loam, Sand

Max Height

0.5-1 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
1–2 years
Max Spread
0.1-0.5 metres
Max Height
0.5-1 metres

Growing Conditions

Chalk Clay Loam Sand
Moisture
Moist but well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun
Aspect
South–facing or West–facing
Exposure
Exposed or Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

  • H1A: under glass all year (>15C)
  • H1B: can be grown outside in the summer (10 - 15)
  • H1C: can be grown outside in the summer (5 - 10)
  • H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
  • H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
  • H4: hardy through most of the UK (-10 to -5)
  • H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
  • H6: hardy in all of UK and northern Europe (-20 to -15)
  • H7: hardy in the severest European continental climates (< -20)
H6

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Asphodelaceae
Native to GB/Ireland
No
Foliage
Semi evergreen
Habit
Clump forming
Potentially harmful
TOXIC to pets (cats) - see the HTA guide to potentially harmful plants for further information and useful contact numbers
Genus
Hemerocallis may be evergreen or herbaceous perennials, with narrow, strap-shaped leaves and funnel-shaped flowers on erect stems in late spring or early summer
Name Status
Accepted

How to Grow

Cultivation

Grow in fertile, well drained soil, in areas that will not dry out in summer. Prefers full sun, flowering is likely to be reduced in shadier situations. Water freely from spring to summer. See Hemerocallis cultivation for details.

Propagation

Propagate by division in early spring or autumn, at least six weeks before the first frost. Divide every 2-3 years to maintain vigour. Propagate from seed in containers in a cold frame in autumn or spring; cultivars will not come true from seed

Suggested planting locations and garden types

  • City and courtyard gardens
  • Cottage and informal garden
  • Patio and container plants
  • Flower borders and beds

Pruning

Cut back flower stems after flowering has finished. Remove dead foliage as required

Pests

May be susceptible to hemerocallis gall midge, aphids, glasshouse red spider mite and thrips. Slugs and snails may damage young leaves

Diseases

May be susceptible to rust diseases. In climates with alternating winter frosts and thaws, bacterial leaf and stem rot (spring sickness) may be a problem; in areas with high temperatures and high humidity, crown rot may cause damage