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Polygala × dalmaisiana AGM

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© RHS

Characteristics

Plant type

Conservatory/Greenhouse

Habit

Bushy

Resilience

Hardiness

H2 (tender - cool or frost-free greenhouse)

Colour

Flower

Purple in Autumn and Summer

Foliage

Dark Green in Autumn, Spring, Summer and Winter

Size

Ultimate height

1-1.5 metres

Ultimate spread

1-1.5 metres

Time to ultimate height

5-10 years


Preferred common name

sweet pea shrub

Family

Polygalaceae


Polygala can be annuals, evergreen perennials or shrubs, with simple leaves and racemes of somewhat pea-shaped flowers

P. x dalmaisiana is a bushy evergreen shrub to 1.5m, with dark green, ovate leaves and terminal racemes of pea-like, reddish-purple flowers 2.5cm long, in summer and autumn

How to grow

Sunlight

  • Full sun
  • Part shade

Aspect

  • South-facing, West-facing or East-facing
  • Sheltered

Cultivation

Grow in a conservatory or greenhouse with a minimum temperature of 5-7°C (41-45°F) or in a container for summer interest outdoors. Use a peat substitute compost in containers. Water freely during growing season and sparingly in winter. Apply a balanced liquid fertiliser monthly when in growth

Soil

  • Well-drained
  • Acid, Alkaline or Neutral
  • Sand, Chalk or Loam

Propagation

Propagate by seed in spring in a temperature of 15°C (59°F). Take softwood cuttings in early summer or semi-ripe cuttings in mid-late summer

Suggested planting locations and garden types

Patio/Container Plants or City/Courtyard Gardens


How to care

Pruning

Pruning group 9

Pests

Glasshouse whitefly and aphids may be a problem under glass

Diseases

Generally trouble free