Pasithea caerulea

RHS Plant Profile

blue pasithea

Synonyms

Pasithea coerulea

Herbaceous Perennial

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A semi-evergreen perennial, to 80cm high in flower, with narrow, strappy green leaves. In early summer, star-shaped deep blue flowers are borne on tall, slender branching stems

Position

Full sun, Partial shade

Soil Types

Chalk, Loam, Sand

Max Height

0.5-1 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity: 2–5 years
Max Spread: 0.1-0.5 metres
Max Height: 0.5-1 metres

Growing Conditions

Chalk Loam Sand

Moisture: Moist but well–drained or Well–drained
pH: Acid or Alkaline 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
Drought Resistance: Yes

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
Genus
Name Status: Correct

How to Grow

Cultivation

Thrives in fertile, free draining soil in full sun or light shade

Propagation

Propagate by seed

Suggested planting locations and garden types

Gravel garden
Banks and slopes
Cut flowers
Wall side borders

Pruning

No pruning required

Pests

Generally pest-free

Diseases

Generally disease-free