Field scabious

Sun

Full sun; tolerates light shade, but flowers less and may lean.

Water

Water regularly while establishing; established plants tolerate dry spells. Avoid persistently wet soil.

Soil

Well-drained, lean to moderately fertile soil, preferably neutral to alkaline. Particularly suited to chalky or limestone soils; avoid wet, heavy clay.

Height

2-4 ft (0.6-1.2 m)

Spread

1-2 ft (0.3-0.6 m)

Flowers

Pale lilac to lavender-blue pincushion flowers from early summer into early autumn, especially if deadheaded.

Foliage

Grey-green, hairy leaves form a basal clump; lower leaves may be unlobed, while upper leaves are more deeply divided.

Growth

Moderate

Care needed

Low

• Pollinators
• Drought tolerant
• Cold hardy
• Wildlife
• Low allergen

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Easy

Toughness

Very tough

Pick your zone, country, light and whether you have pets.

1. Planting day

   1 ft (0.3 m)

2. After 1 year

   1.6 ft (0.5 m)

3. After 2 years

   2.3 ft (0.7 m)

4. After 3 years

   3 ft (0.9 m)

   full size

About 3 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Safe

Native to

the UK

Invasive in

the US and Canada

In the garden

Spreads vigorously: plan to contain it.

Growth rate

Moderate

• Check local weed regulations before planting, particularly in western North America.
• Water through the first growing season whenever the root zone becomes dry.
• Avoid routine feeding; rich soil encourages floppy growth.
• Keep mulch away from the crown, especially in wet winters.
• Support tall stems with twiggy stakes in exposed gardens.
• Remove unwanted seedlings promptly and deadhead before seed ripens where spread is a concern.

Pruning. Remove faded flower heads during summer to encourage further flowering and limit seedlings. Cut dead stems back to the basal clump in late winter or early spring; where escape is a risk, remove flowering stems before they set seed.

Early spring

Cut away dead stems without damaging new basal growth; remove unwanted seedlings.

Spring

Plant into well-drained soil and water thoroughly; divide established clumps if needed.

Late spring

Add discreet supports before tall stems start to lean.

Summer

Deadhead regularly and water newly planted clumps during dry spells.

Early autumn

Remove remaining flower heads before seed disperses where self-seeding is unwanted.

Winter

Check that water is not collecting around the crown; avoid adding moisture-retentive mulch over it.

• Thread through a sunny cottage border with hardy geraniums and meadow sage for a loose, long-flowering display.
• Combine with fine-textured grasses in naturalistic planting, allowing the flower stems to rise above lower foliage.
• Use in a lean, sunny gravel border with yarrow and other drought-tolerant perennials.
• Include in a flowering meadow within its native range, where its open flowers provide accessible insect forage.

Garden styles it suits: Cottage garden, Wildflower, New perennial (prairie), Pollinator garden, Dry gravel garden and English country.

Plant it with: Yarrow, Meadow sage, Tufted hair grass, Hardy geranium and Small scabious.

Wildlife: Nectar and pollen attract bees, butterflies, hoverflies and other insects. It is a useful meadow flower within its native range, but its wildlife value does not outweigh the risk of introducing it where it is invasive.

• Flopping stems: provide full sun, avoid nitrogen-rich feed and support stems early if necessary.
• Crown or root rot in wet soil: improve drainage or move plants to a raised, freely draining position.
• Powdery mildew: give plants more airflow, water at soil level and remove badly affected foliage.
• Excessive self-seeding: deadhead before seeds mature and remove seedlings while small.

Not known to be toxic to people, cats, dogs or horses. No particular poisonous part is established, although species-specific safety information is limited; do not treat it as an edible plant.

Where it spreads. Spreads by seed and can invade pasture, hayfields and grassland in western North America. It is listed as a noxious weed in Alberta, parts of British Columbia, Montana and Washington. Check current local restrictions and do not plant it where regulated or close to vulnerable grassland.

• Small scabious (Scabiosa columbaria)

  Usually shorter and more finely textured, with narrower, finely divided upper leaves. Its individual florets have five lobes, whereas field scabious florets have four.

• Devil's-bit scabious (Succisa pratensis)

  Has rounder, usually darker blue-purple flower heads and mostly undivided leaves. It generally favours moister soil than field scabious.

• Macedonian scabious (Knautia macedonica)

  Typically bears deep crimson to wine-red flowers rather than pale lilac ones; its garden forms can otherwise have a similar branching habit.

Knautia honours the botanists Christian and Christoph Knaut, while arvensis means 'of fields'.

Propagation. Sow seed in pots in autumn or spring; germination can be uneven, and a period of winter cold may help. Divide established clumps in spring. Do not collect or distribute seed where the plant is regulated.

Accepted botanical name

Knautia arvensis

In the US and Canada

Introduced in Canada and the lower 48 states.

Native range

Altay, Austria, Baltic States, Belarus, Belgium, Bulgaria, Buryatiya, Central European Rus, Czechoslovakia, Denmark, East European Russia and Finland.

Measured

Soil pH 7 to 7.5. Average height 31 cm.

Sources: GBIF (CC BY 4.0), USDA PLANTS and Trefle (CC BY 4.0). The care and design notes are LandscapeGPT's own.