Asclepias incarnata 'Soulmate'

RHS Plant Profile
swamp milkweed 'Soulmate'
Bulbs Herbaceous Perennial

An upright, clump-forming perennial to around 90cm in height, with narrow, lance-shaped, dark green leaves. Small, fragrant, waxy, dark rose pink flowers with white centres appear in dense clusters on sturdy stems from July through to September. These are followed by seed pods that split to release silky-haired seeds. A great choice for cutting

Position

Full sun

Soil Types

Clay, 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

Clay Loam Sand
Moisture
Moist but well–drained or Poorly–drained
pH
Acid or Alkaline or Neutral

Position

Full sun
Aspect
South–facing or West–facing
Exposure
Sheltered
Hardiness
H4

Colour & Scent

Fragrance Flower
Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Apocynaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Bushy
Potentially harmful
Harmful if eaten. Wear gloves and other protective equipment when handling
Genus
Asclepias can be evergreen or deciduous perennials or subshrubs, with simple, entire leaves and umbel-like clusters of small, distinctively shaped flowers followed by paired fruits containing seeds embedded in silky fibres
Name Status
Accepted

How to Grow

Cultivation

Grow outdoors in moist, fertile, loamy soil in full sun. Will thrive near a pond or stream

Propagation

Propagate by seed or by division, or root basal cuttings in spring

Suggested planting locations and garden types

  • City and courtyard gardens
  • Cottage and informal garden
  • Prairie planting
  • Cut flowers
  • Flower borders and beds

Pruning

No pruning required

Pests

Generally pest-free

Diseases

Generally disease-free