Diascia integerrima

RHS Plant Profile

entire-leaved twinspur

RHS

Synonyms

Diascia integrifolia

Herbaceous Perennial

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A vigorous, spreading, semi-evergreen perennial to around 35cm in height with narrow green leaves. Racemes of dark pink flowers appear in summer to autumn

Position

Full sun

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
pH: Acid or Alkaline or Neutral

Position

Full sun

Aspect: South–facing or East–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): H4

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Scrophulariaceae
Native to GB/Ireland: No
Foliage: Semi evergreen
Habit: Matforming
Genus: Diascia can be annuals or semi-evergreen perennials, usually making a mat of neat foliage with racemes of cup or bell-shaped flowers, usually in shades of pink, and each with two short spurs
Name Status: Unresolved
Plant Range: Temp S Africa

How to Grow

Cultivation

Grow in fertile, moist but well-drained soil in full sun. Can be grown in a container; water in dry periods This plant was included in the RHS Diascia (twinspur) perennial trial 2024-2025 https://www.rhs.org.uk/plants/trials-awards/ongoing-plant-trials/diascia-perennial

Propagation

Propagate by seed sown as soon as ripe or in early spring or propagate by taking softwood cuttings in summer

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Patio and container plants
Rock garden
Flower borders and beds
Garden edging

Pruning

Deadhead to prolong flowering

Pests

May be susceptible to slugs and snails

Diseases

Generally disease-free