Euphorbia pilosa (hairy spurge) — Clump-forming, upright or spreading sub-shrub

Overview

Euphorbia pilosa is a clump-forming, upright or spreading sub-shrub perennial in the genus Euphorbia, part of the Euphorbiaceae family, with evergreen, semi-evergreen or deciduous; narrow, often blue-grey or glaucous, sometimes red-tinted in autumn foliage. Euphorbia pilosa grows best in full sun to partial shade; the woodland species tolerate dry shade, and tolerates light to moderately fertile loam and sand or chalk soils and acid and neutral or alkaline pH. Its UK hardiness is rated H4-H7. Suggested uses include ground cover, rock gardens, borders and woodland gardens. It is native to South Africa.

About

Euphorbia pilosa is a clump-forming perennial sub-shrub with narrow, often blue‑grey (glaucous) leaves and an upright to spreading habit. Native to South Africa, it may be evergreen, semi‑evergreen or deciduous depending on site and flowers from May to September. It prefers well‑drained light soils such as loam, sand or chalk in full sun to partial shade and tolerates exposed or sheltered positions. Handle with care: the milky sap can irritate skin and eyes.

About the genus

Euphorbia is a large and diverse genus of flowering plants, commonly called spurge, in the family Euphorbiaceae.

Wikipedia contributors, "Euphorbia", CC BY-SA 4.0 — Euphorbia

In the garden

Euphorbia pilosa is a perennial member of the Euphorbiaceae from South Africa, growing as a clump-forming upright or spreading sub-shrub. The leaves are narrow and often glaucous, sometimes taking a red tint in autumn, while flowering occurs from May to September. Its seasonal behaviour can range from evergreen to deciduous depending on local conditions. Sit it in full sun to partial shade; woodland forms will tolerate dry shade. It favours light to moderately fertile soils — loam, sand or chalk — across acid, neutral and alkaline pH. Good drainage is essential as most plants dislike winter wet, and it performs in any aspect and in exposed or sheltered situations. In UK hardiness terms it spans H4 to H7 (roughly average to fully hardy), so choice of micro-site matters in colder gardens. Use Euphorbia pilosa as ground cover, in rock gardens, at the front of borders or within woodland plantings where its low, spreading clumps can fill gaps. Take care when cutting back or handling growth because the milky sap is a skin and eye irritant; wear gloves and eye protection to avoid contact with the sap.

Growing conditions

Best soil and position for Euphorbia

Sunlight: Full sun to partial shade; the woodland species tolerate dry shade
Soil type: Light to moderately fertile loam, sand or chalk
Soil pH: Acid, neutral or alkaline
Soil moisture: Well drained; most dislike winter wet
Aspect: Any
Exposure: Exposed or sheltered
UK hardiness: H4-H7

Plant details

Euphorbia pilosa size, habit and characteristics

Plant type: Perennial
Habit: Clump-forming, upright or spreading sub-shrub
Foliage: Evergreen, semi-evergreen or deciduous; narrow, often blue-grey or glaucous, sometimes red-tinted in autumn
Suggested uses: Ground cover, rock gardens, borders, woodland gardens
Native to: South Africa
Toxicity: The milky sap is a skin and eye irritant

Care notes

Pruning and caring for Euphorbia pilosa

Cultivation: Easy and largely self-sufficient given drainage. The milky sap is a genuine irritant to skin and eyes, so wear gloves and eye protection when cutting back and never handle the plant in strong sun. Most flower on stems produced the previous year, which makes correct timing of the cut essential. The spreading species can be invasive in loose soil, so site them accordingly.
Pruning: On the shrubby evergreen kinds, cut flowered stems right to the base once the bracts fade in summer, leaving this season's new shoots to flower next year. Cut herbaceous species down in late autumn.
Propagation: Divide herbaceous kinds in spring. Take basal cuttings of shrubby species in spring and rinse the cut end to stop the latex sealing it. Many self-seed freely.
Pest resistance: Rarely troubled by pests; aphids occasionally gather on soft new growth.
Disease resistance: Generally healthy. Euphorbia rust causes orange spotting and distorted shoots on some species and affected growth should be removed.

Frequently asked questions

How do I grow Euphorbia pilosa?

Easy and largely self-sufficient given drainage. The milky sap is a genuine irritant to skin and eyes, so wear gloves and eye protection when cutting back and never handle the plant in strong sun. Most flower on stems produced the previous year, which makes correct timing of the cut essential. The spreading species can be invasive in loose soil, so site them accordingly.

Where is the best place to plant Euphorbia pilosa?

Euphorbia pilosa prefers full sun to partial shade; the woodland species tolerate dry shade. It suits exposed or sheltered positions.

What soil does Euphorbia pilosa need?

Euphorbia pilosa grows best in light to moderately fertile loam and sand or chalk soil. It prefers acid and neutral or alkaline soil. Aim for soil that stays well drained; most dislike winter wet.

How do I prune Euphorbia pilosa?

On the shrubby evergreen kinds, cut flowered stems right to the base once the bracts fade in summer, leaving this season's new shoots to flower next year. Cut herbaceous species down in late autumn.

Is Euphorbia pilosa hardy in the UK?

Euphorbia pilosa has an RHS hardiness rating of H4, meaning it is hardy through an average UK winter, tolerating -10 to -5°C.

How do I propagate Euphorbia pilosa?

Divide herbaceous kinds in spring. Take basal cuttings of shrubby species in spring and rinse the cut end to stop the latex sealing it. Many self-seed freely.

Is Euphorbia pilosa toxic?

The milky sap is a skin and eye irritant.

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