Myrtle-leaf Milkwort
Polygala myrtifolia
"Purple Queen"
About this plant
Polygala myrtifolia, commonly known as Myrtle-leaf Milkwort, is an evergreen shrub with small, glossy leaves resembling myrtle leaves. It produces attractive, pea-like flowers in shades of purple, pink, or white, which bloom mainly in spring and summer. This plant is popular in gardens for its colorful flowers and ability to attract pollinators like bees and butterflies. It is often used as a decorative shrub in borders or containers and is valued for its drought tolerance and ornamental appeal.
Taxonomy
- Genus
- Polygala
- Family
- Polygalaceae
- Higher classification
- Fabales
- Plant type
- Shrub
- Lifespan
- Perennial
Origin & Distribution
- Native region
- South Africa
- Distribution
- Native to South Africa; cultivated in Mediterranean climates, parts of Australia, and California.
Care
- Light preference
- Full sun
- Suitable locations
- Outdoor, Balcony, Greenhouse
- Preferred window facing
- South-facing, West-facing, East-facing
- Watering frequency
- Moderate
- Watering interval
- 7–14 days
- Humidity
- Normal
- Minimum
- 5 °C
- Maximum
- 35 °C
- Optimal
- 15–25 °C
- USDA hardiness zones
- 9–11
- Soil pH
- 6.0–7.5 (slightly acidic to neutral)
- Soil type
- well-draining loam or sandy soil
Watering. Water regularly during the growing season but allow the soil to dry out slightly between waterings. Reduce watering in winter.
Fertilizing. Feed with a balanced, slow-release fertilizer in early spring and again in mid-summer to support healthy growth and flowering.
Polygala myrtifolia is a fairly tough shrub that prefers sunny spots and well-draining soil. It can tolerate some drought once established but benefits from occasional watering during dry periods. Watch for root rot if overwatered and prune lightly to maintain shape and encourage flowering.
Propagation
- Propagation methods
- Cuttings, Seeds
- Care difficulty
- Medium
Ornamental features
- Flowering
- Yes
- Flowering period
- spring–summer
Glossy green leaves and vibrant purple or pink pea-like flowers that attract pollinators.
Toxicity & Safety
- Toxic to humans
- Non-toxic
- Toxic to pets
- Non-toxic
- Weed potential
- Not considered a weed
Non-toxic to humans and pets, making it safe for homes with children and animals.
Allergy information
- Allergy risk
- Low
- Allergy triggers
- Pollen
- Pollen level
- Low
Polygala myrtifolia may cause mild allergic reactions in sensitive individuals, mainly due to its pollen. People with pollen allergies might experience sneezing or itchy eyes. To reduce exposure, avoid planting it near windows or areas where you spend a lot of time during its flowering season.
Common problems
Overwatering can cause root rot; poor flowering may result from too much shade or lack of pruning; occasionally affected by aphids or scale insects.
Uses
Used mainly as an ornamental shrub in gardens and landscapes for its attractive flowers and evergreen foliage.
Notes
Prune lightly after flowering to maintain shape and encourage bushier growth. Repot young plants annually if grown in containers. Avoid waterlogged soil to prevent root diseases.