Triteleia 'Blues'

RHS Plant Profile
grassnut 'Blues'

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A cormous perennial, with narrow, strap-shaped basal leaves in spring. Loose clusters of funnel-shaped, violet blue flowers, with a darker blue stripe along the centre of each petal, are held on stems to around 45cm high in early summer

Position

Full sun

Soil Types

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

Loam Sand
Moisture
Well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun
Aspect
South–facing or West–facing
Exposure
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)
H4

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Asparagaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Clump forming
Genus
Triteleia are cormous perennials with linear basal leaves and umbels of funnel-shaped flowers opening as the leaves die down
Name Status
Adopted

How to Grow

Cultivation

In mild areas, may be planted out in light, fertile, sandy soil in full sun. In areas prone to severe frosts, provide winter protection, or grow in containers that can be moved indoors over winter. Water freely while in growth; keep almost dry while dormant

Propagation

Propagate by seed or by division, separating corms while the plants are dormant. Plants grown from seed may take 3-5 years to mature

Suggested planting locations and garden types

  • City and courtyard gardens
  • Cottage and informal garden
  • Patio and container plants
  • Conservatory and greenhouse
  • Cut flowers
  • Flower borders and beds

Pruning

No pruning required

Pests

Generally pest-free

Diseases

Generally disease-free