Saponaria spp.

soapwort

Caryophyllaceae

Europe, Mediterranean, and temperate Asia

Attracts Pollinators Attracts Butterflies Deer Resistant Drought Tolerant Fragrant (light)Container Friendly

SunFull Sun – Part Shade

WaterLow · drought-tolerant

HardinessZones 3–8

Overview

Saponaria spp. is a genus of around thirty species of annual, biennial, and perennial herbs in the pink family (Caryophyllaceae), native to Europe, the Mediterranean, and temperate Asia. Plants range from upright clumps 1-3 ft (30-90 cm) tall, as in the spreading S. officinalis, to low trailing mats a few inches high, as in S. ocymoides. The paired, smooth-edged leaves are 1-3 in (2.5-8 cm) long on jointed stems. Clusters of five-petalled flowers, 0.5-1 in (12-25 mm) across in pink, rose, or white, open from late spring through summer and are lightly fragrant in some species. The roots, leaves, and stems are rich in saponins and produce a lather in water, the source of the name soapwort. Upright species such as S. officinalis spread by creeping roots and can become invasive, while the mat-forming species stay compact. Plants grow easily on poor, free-draining soils in sun.

Native Range

Saponaria spp. is native to Europe, the Mediterranean Basin, and temperate Asia, with the centre of diversity around the mountains of southern Europe and western Asia. Species grow on rocky slopes, scree, grassland, and disturbed ground, and S. officinalis has naturalized widely beyond its range.

Suggested Uses

Grown in cottage, rock, and gravel gardens, on walls and banks, and in wildlife plantings, with mat-forming species spilling over rocks and edges. Spreading species suit naturalized or rough ground where their running habit is welcome.

How to Identify

Paired, smooth leaves on jointed, swollen-noded stems carry clusters of five-petalled pink to white flowers, each backed by a tubular calyx. Crushed leaves and roots produce a soapy lather in water. The robust, running S. officinalis and the low, mat-forming S. ocymoides bracket the range of the genus.

Appearance

Size & Dimensions

Height3" - 3'

Width/Spread1' - 2'

Colors

Flower Colors

Foliage Colors

Bloom Information

Bloom Period

~12 weeks

Spring Summer Fall

Flowering runs from late spring through summer, roughly May to September depending on species, with pink to white flowers in branched clusters. Mat-forming species bloom heavily in late spring, while S. officinalis flowers over a long summer season.

Detailed Descriptions

Flower Description

pink to white

Foliage Description

green

Growing Conditions

Sun Requirements

SunFull Sun SunPartial Shade

Requires 5-10 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 - 7.5(Neutral)

357912

Soil Types

sand loam rocky chalk

Drainagewell drained

Water & Climate

Water Needs

Low

Frost Tolerance

hardy

Time to Maturity

1-2 years

Drought Tolerance

Drought tolerant when established

Care & Maintenance

Care Guide

Saponaria spp. grows in full sun to light shade on free-draining, lean soils, including sandy, gravelly, and rocky ground, and tolerates drought once established. A soil pH near 6.0-7.5 is suitable, and the genus accepts slightly alkaline conditions. Upright running species such as S. officinalis spread vigorously by root and seed and can overrun beds, so they suit rough areas more than tidy borders. Rich, wet soils cause weak, floppy growth. Cutting back after the first flush can prompt a lighter rebloom.

Pruning

Cut plants back after the main flowering to tidy growth and encourage a second flush, and shear mat-forming species lightly once blooming ends. Lift and divide spreading species to control their running roots.

Pruning Schedule

summer