Tradescantia (Andersoniana Group) 'Isis'

RHS Plant Profile

spider lily 'Isis'

RHS

Synonyms

Tradescantia × andersoniana 'Isis'
Tradescantia virginiana 'Isis'

Herbaceous Perennial

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'Isis' is a perennial to 60cm, forming dense clumps of copious narrow, arching leaves and small clusters of deep violet-blue flowers 3-4cm in width from early summer

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam

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 Clay Loam

Moisture: Moist but well–drained
pH: Acid or Alkaline or Neutral

Position

Full sun Partial shade

Aspect: West–facing or East–facing or South–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: Commelinaceae
Native to GB/Ireland: No
Foliage: Evergreen
Habit: Tufted
Potentially harmful: Skin allergen. Wear gloves and other protective equipment when handling
Genus: Tradescantia can be trailing or tufted perennials with usually fleshy, evergreen foliage and distinctive, 3-petalled flowers
Name Status: Accepted

How to Grow

Cultivation

Thrives in fertile, moist but well-drained soil. Flower production is better in full sun, but light afternoon shade is beneficial in areas with hot summers. Plants may need support, see staking perennials

Propagation

Propagate by division in spring or autumn

Suggested planting locations and garden types

Flower borders and beds

Pruning

After flowering cut back flowered stems to prevent seeding and to encourage further flowers

Pests

May be susceptible to aphids, vine weevil, slugs and snails

Diseases

May be susceptible to fungal leaf spot and a rust