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Conservatory Greenhouse

Polygala × dalmaisiana

sweet pea shrub

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

Synonyms
Polygala myrtifolia 'Grandiflora'
Polygala myrtifolia var. grandiflora misapplied

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Size
Ultimate height
1–1.5 metres
Time to ultimate height
5–10 years
Ultimate spread
1–1.5 metres
Growing conditions
Chalk
Loam
Sand
Moisture
Well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green
Summer Purple Green
Autumn Purple Green
Winter Green
Position
  • Full sun
  • Partial shade
Aspect

West–facing or East–facing or South–facing

Exposure
Sheltered
Hardiness
H1C
Botanical details
Family
Polygalaceae
Native to GB / Ireland
No
Foliage
Evergreen
Habit
Bushy
Genus

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

Name status

Correct

How to grow

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-free compost in containers. Water freely during growing season and sparingly in winter. Apply a balanced liquid fertiliser monthly when in growth

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
  • City and courtyard gardens
  • Patio and container plants
Pruning

Pruning group 9

Pests

Glasshouse whitefly and aphids may be a problem under glass

Diseases

Generally disease-free

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