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Polygala vulgaris

common milkwort

Polygalaceae Europe

Attracts Pollinators Drought Tolerant

SunFull Sun – Part Shade

WaterLow · drought-tolerant

HardinessZones 5–8

Overview

Polygala vulgaris is a low-growing perennial in the family Polygalaceae, reaching 4-14 inches (10-35 cm) tall and 4-10 inches (10-25 cm) wide. Slender, wiry stems trail at the base before turning upward, carrying alternate, untoothed leaves 0.2-1.4 inches (5-35 mm) long; the lower leaves are smaller and more rounded than the narrow, pointed upper ones. From May to September the stems bear loose racemes of 10-40 flowers, each 0.2-0.3 inch (5-8 mm) long, with two enlarged petal-like inner sepals (wings) flanking a fringed keel petal. Flower colour ranges from gentian-blue through pink and mauve to white, often varying within a single population. The fruit is a flattened, two-chambered capsule. The species grows in neutral to calcareous grassland, heath, dune, and cliff-top turf across much of Europe, kept open by grazing or low fertility. It withstands low-nutrient and seasonally dry ground but is slow to re-establish after root disturbance and declines where taller vegetation shades it out, so it is scarce on fertilised or abandoned grassland. Plants are deep-rooted and long-lived, supporting grassland bees and other insects as part of species-rich meadow communities.

Native Range

Native to Europe, ranging from Britain and Scandinavia south to Spain, Italy, and the Balkans and east into western Russia. It occupies unimproved grassland, heath, dune slacks, and open cliff tops, usually on neutral to lime-rich soils.

Suggested Uses

Grown in wildflower meadows, chalk and limestone grassland restoration, green roofs, and rock or gravel gardens. Its low stature suits the front of sunny, low-fertility plantings where taller plants will not overtop it.

How to Identify

A low perennial with wiry stems bearing alternate, untoothed leaves that are narrow and pointed near the tip and smaller and oval toward the base. The flowers, 0.2-0.3 inch (5-8 mm) long, carry two enlarged coloured wing-sepals enclosing a small fringed keel petal, and vary from gentian-blue through pink to white. It differs from heath milkwort Polygala serpyllifolia, whose lowest leaves are opposite rather than alternate and whose flower spikes carry fewer blooms.

Appearance

Size & Dimensions

Height4" - 1'2"

Width/Spread4" - 10"

Colors

Flower Colors

Foliage Colors

Fall Foliage Colors

Bloom Information

Bloom Period

~18 weeks

Spring Summer Fall

Flowering runs from May to September, peaking in June and July. Each slender raceme opens its 10-40 flowers in succession from the base upward over several weeks. Blue-flowered plants predominate, though pink, mauve, and white forms occur in the same colonies.

Detailed Descriptions

Flower Description

blue, pink, mauve, or white

Foliage Description

green

Growing Conditions

Sun Requirements

SunFull Sun SunPartial Shade

Requires 6-10 hours of direct sunlight daily

• Full Sun: 6+ hours of direct sunlight

• Partial Shade: 3-6 hours of direct sunlight

• Full Shade: Less than 3 hours of direct sunlight

Soil Requirements

pH Range6.0 - 8.0(Neutral)

357912

Soil Types

loam sand chalk rocky

Drainagewell drained

Water & Climate

Water Needs

Low

Frost Tolerance

hardy

Time to Maturity

2-3 years

Drought Tolerance

Drought tolerant when established

Care & Maintenance

Care Guide

Polygala vulgaris grows in full sun to light shade on free-draining neutral to alkaline soils of low fertility. It withstands drought once established but fails in waterlogged ground and on rich, fertilised soils, where coarser plants overtake it. Pot-grown plants set into short, open turf establish more reliably than bare-root divisions, which recover slowly after root disturbance. Supplementary feeding is counterproductive, as added nutrients favour competing grasses and shorten the plant's persistence. It suits wildflower meadows, green roofs, and gravel or rock plantings kept clear of vigorous neighbours. Seed germinates after autumn sowing followed by a period of winter cold.

Pruning

No routine pruning is needed. Flower stems can be left to set and shed seed or cut back in autumn within a single annual meadow cut. Periodic removal of surrounding tall growth keeps the low rosettes exposed to light.