Coreopsis grandiflora 'Illico'

RHS Plant Profile
large-flowered tickseed 'Illico'

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Herbaceous Perennial
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A small, compact perennial with lance-shaped, grey-green leaves and abundant, daisy-like golden-yellow flowers with toothed petal edges that are held on long stalks. It flowers for a long period of time over summer

Position

Full sun, Partial shade

Soil Types

Chalk, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
2–5 years
Max Spread
0.1-0.5 metres
Max Height
0.1-0.5 metres

Growing Conditions

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

Position

Full sun Partial shade
Aspect
East–facing or 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)
H5

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Asteraceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Clump forming
Genus
Coreopsis can be annuals or perennials, with paired, simple, palmate or pinnately divided leaves and long-stalked, daisy-like flower-heads
Name Status
Accepted

How to Grow

Cultivation

Will grow well in fertile, well-drained soil in partial shade but preferably in full sun. Will need to be kept moist during spells of dry weather.

Propagation

Propagate by seed in late winter, by division in spring or autumn and basal root cuttings in spring.

Suggested planting locations and garden types

  • Cottage and informal garden
  • City and courtyard gardens
  • Coastal
  • Patio and container plants
  • Wildlife gardens
  • Prairie planting
  • Flower borders and beds

Pruning

Deadhead for continuous flowering and cut back in winter.

Pests

May be susceptible to slugs and snails

Diseases

Generally disease-free