Myrtle-leaf milkwort - Polygala myrtifolia (Care, Characteristics, Flower, Images)

Myrtle-leaf milkwort

Also known as: Sweet pea shrub, September bush, Showy milkwort

Myrtle-leaf milkwort (Polygala myrtifolia) is a robust widely branching shrub that will grow to 1.8 m tall. It blooms in spring with purple, butterfly-shaped flowers that cluster at the tip of the stem. Tolerant of poor soils, drought and exposure to salt. Seeds from the plant remain viable for years and will germinate after wildfire.

Scientific classification

Species

Myrtle-leaf milkwort (Polygala myrtifolia)

Legumes, milkworts and allies

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Perennial

Lifespan

Shrub

Plant Type

Spring, Summer, Fall

Bloom Time

2 m to 4 m

Plant Height

Purple, Pink, White

Flower Color

Green, White, Purple

Stem Color

Non-dormant

Dormancy

Evergreen

Leaf type

20 - 38 ℃

Ideal Temperature

Images of Myrtle-leaf milkwort

Distribution of Myrtle-leaf milkwort

Distribution Map

Myrtle-leaf milkwort is native to the southern parts of the African continent and has been introduced to diverse regions, where it is now cultivated. It has adapted to environments beyond its natural range, particularly in various temperate and Mediterranean-climate areas. Its successful cultivation and introduction have expanded its presence across multiple continents.

Native

Cultivated

Invasive

Introduced

No species reported

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Hemisphere Trend Curve

Northern

Sorthern

Flowering

Fruiting

Culture

Garden Use

Myrtle-leaf milkwort adds showy blossoms for garden backgrounds and floral screens in warm coastal garden sites. This shrub’s purple, white, and pink flowers keep on blooming for many months, contrasting nicely with the narrow green leaves as an accent in garden borders.

Interesting Facts

Myrtle-leaf milkwort (Polygala myrtifolia) has been studied by researchers at the University of KwaZulu-Natal who have discovered that the plant has many antimicrobial, antibacterial, and antifungal properties.

Name Story

Myrtle-leaf milkwort: The myrtle-leaf milkwort’s Latin genus name ‘Polygala’ can be translated as ‘much milk’; this name is likely derived from the fact that colonizers thought that this native South African plant stimulated the milk production of their imported European cows.

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Care Guide for Myrtle-leaf milkwort

Every 1-2 weeks

Water

Full sun

Sunlight

20 - 38 ℃

Ideal Temperature

Garden Soil

Soil Type

Water: Myrtle-leaf milkwort thrives in moist conditions, requiring watering every 1-2 weeks to maintain slightly moist soil. With moderate drought tolerance, it prefers outdoor growth in natural light, flourishing in well-draining soil that simulates its native habitat.

Fertilize: For myrtle-leaf milkwort, use balanced fertilizers monthly in spring and summer, then every 6-8 weeks in cooler months. Follow package instructions, using less for young or potted plants. Avoid over-fertilizing to prevent root burn, and use slow-release formulas for consistent nutrients, watering deeply afterward.

Pruning: Myrtle-leaf milkwort, noted for its vibrant purple flowers, needs careful pruning in late spring post-flowering to encourage new growth. Remove dead branches and thin dense areas for air circulation. Light, regular trims are best for enhancing flowering and promoting a fuller, healthier plant.

Propagation: Myrtle-leaf milkwort is valued for its aesthetic qualities and hardiness. To propagate, use healthy stem cuttings with leaf nodes, apply rooting hormone, and place in a moist, well-draining medium. Maintain humidity; roots may develop within weeks before transferring to individual pots.

Repotting: Spring is the best time to repot myrtle-leaf milkwort every two years using a slightly larger pot. Position myrtle-leaf milkwort in indirect light and maintain consistent moisture, while minimizing root disturbance to reduce stress. This approach ensures healthy acclimatization and promotes thriving growth in its new environment.

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