Prairie mallow

Sun

Full sun; light afternoon shade is useful in hot inland gardens.

Water

Water regularly while establishing. Established plants tolerate some summer dryness, but occasional deep watering during flowering helps prevent early dormancy.

Soil

Well-drained sandy, loamy or gravelly soil with moderate fertility. Avoid waterlogged ground, especially in winter.

Height

2-3 ft (0.6-0.9 m)

Spread

1-2 ft (0.3-0.6 m)

Flowers

Late spring to midsummer; usually pink to rose-purple, sometimes white, with shallow, five-petalled flowers along upright stems.

Foliage

Green, rounded to shallowly lobed basal leaves, with more deeply divided leaves higher on the stems. Growth may die back early during prolonged summer drought.

Growth

Moderate

Care needed

Low

• Pollinators
• Drought tolerant
• Wildlife
• Low allergen

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

Difficulty

Easy

Toughness

Fairly tough

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

1. Planting day

   1 ft (0.3 m)

2. After 1 year

   1.5 ft (0.45 m)

3. After 2 years

   2 ft (0.6 m)

4. After 3 years

   2.5 ft (0.75 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

Growth rate

Moderate

• Water deeply during the first growing season, allowing the surface soil to dry between waterings.
• Give established plants occasional deep watering during prolonged dry weather if you want a longer flowering season.
• Apply a thin layer of compost in spring; avoid heavy feeding, which encourages floppy growth.
• Keep mulch clear of the crown and improve drainage before planting in heavy soil.
• Support taller flowering stems with twiggy stakes in exposed gardens.

Pruning. Remove spent flower spikes down to a healthy leaf to discourage seeding and sometimes encourage more flowers. Cut dead stems to the base in late autumn or early spring, leaving any healthy basal leaves intact.

Early spring

Remove dead stems and check that the crown has not remained wet through winter.

Spring

Plant container-grown plants in well-drained soil and water them in thoroughly.

Mid-spring

Apply a thin compost dressing and put discreet supports around plants in windy positions.

Late spring

Check young growth for slugs and snails, and water new plants during dry spells.

Summer

Remove faded flower spikes, or leave a few to ripen if you want to collect seed.

Autumn

Clear collapsed stems if necessary and keep fallen debris away from the crown.

• Plant in small groups through the middle of a cottage border for airy vertical accents.
• Combine with fine-textured grasses and yarrow in an informal meadow-style planting.
• Use among catmint and hardy geraniums for a soft pink, blue and purple border.
• Include in a sunny western North American native planting where its soil and moisture needs suit the site.

Garden styles it suits: Cottage garden, Wildflower, Pollinator garden, New perennial (prairie), Pastel border and California native.

Plant it with: Yarrow, Catmint, Hardy geranium, Prairie dropseed, Beardtongue and California poppy.

Wildlife: Flowers provide pollen and nectar for bees and are also visited by butterflies. It is useful in pollinator planting, particularly within its native range.

• Slugs and snails can eat emerging shoots: inspect at dusk, remove them by hand and reduce damp hiding places beside the crown.
• Rust can cause orange-brown pustules on leaves: remove affected foliage, improve air circulation and avoid wetting the leaves when watering.
• Crown rot can kill plants in wet winter soil: improve drainage or move plants to a raised bed, keeping mulch away from the crown.
• Flower stems may flop in shade or rich soil: provide more sun, avoid high-nitrogen fertiliser and use discreet supports.

Not known to be toxic to people, cats, dogs or horses. Species-specific safety information is limited; treat it as an ornamental rather than a food plant.

• Musk mallow (Malva moschata)

  Musk mallow usually has a bushier, more branched habit and flowers clustered around the upper leaf joints rather than arranged along distinct upright spikes.

• Hollyhock (Alcea rosea)

  Hollyhocks generally have much taller, sturdier stems, larger flowers and large, rough, rounded leaves; prairie mallow is finer-textured and smaller.

Sidalcea combines Sida and Alcea, the names of two other mallow-family genera, while malviflora means mallow-flowered.

Propagation. Sow seed in pots outdoors in autumn; winter chilling can help germination, which may be uneven. Divide established clumps carefully in early spring. Named garden selections may not come true from seed.

Accepted botanical name

Sidalcea malviflora

Native range

California, Mexico Northwest and Oregon.

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