Downy clematis

Sun

Full sun or partial shade; afternoon shade is helpful in warmer climates. Keep the root area cool.

Water

Keep evenly moist while establishing. Once established, water deeply during dry spells, allowing excess water to drain away.

Soil

Humus-rich, well-drained soil, preferably neutral to slightly alkaline. Avoid waterlogged ground, especially in winter.

Height

8-12 ft (2.4-3.7 m)

Spread

3-5 ft (0.9-1.5 m)

Flowers

Early to mid-spring; nodding blue to violet-blue flowers with numerous narrow inner segments. Named selections also come in pink, purple and white.

Foliage

Green, divided leaves with toothed leaflets; leaves fall in autumn.

Growth

Moderate

Care needed

Low

• Pollinators
• Cold hardy
• 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

   2 ft (0.6 m)

2. After 1 year

   3 ft (0.9 m)

3. After 2 years

   4 ft (1.2 m)

4. After 3 years

   5 ft (1.5 m)

5. After 5 years

   6 ft (1.8 m)

   full size

About 4 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

Toxic

Growth rate

Moderate

• Provide trellis, wires or twiggy supports thin enough for the leaf stalks to grip.
• Plant with the crown at approximately its nursery soil level; this early-flowering clematis does not need deep planting.
• Water deeply during the first growing season and during prolonged drought.
• Apply compost or leaf mould in spring, keeping mulch clear of the stems.
• Feed lightly with a balanced fertiliser in spring if growth is weak or the soil is poor.
• Keep the roots shaded with mulch or nearby low-growing plants without crowding the crown.

Pruning. Pruning group 1: flowers form on the previous year's growth, so avoid routine winter or early-spring cutting. Immediately after flowering, remove dead or damaged stems and shorten only those shoots that have outgrown their space.

Early spring

Check supports and loosely guide new shoots into place; leave healthy older stems intact for flowering.

Spring

Apply compost or leaf mould and water if the soil is dry.

Late spring

After flowering, lightly prune only if needed to control size or remove damaged growth.

Summer

Water during prolonged dry spells and retain the silky seedheads for display.

Early autumn

Plant in well-drained soil while conditions are mild, allowing time for roots to establish.

Late autumn

Check ties and drainage; keep wet mulch and fallen debris away from the crown.

• Train over a small arch or narrow trellis for spring flowers at eye level.
• Allow it to climb through an open, sturdy shrub for a loose, natural effect.
• Grow against a fence with later-flowering climbers to extend the season.
• Use beside a woodland-edge path with hellebores and spring bulbs.

Garden styles it suits: Cottage garden, English country, Woodland, Romantic rose garden, Blues and silvers and Mountain lodge.

Plant it with: Hellebores, Epimediums, Snowdrops, Hardy geraniums, Hostas and Astrantias.

Wildlife: Flowers provide pollen for visiting insects, including bees. Dense growth can shelter small garden animals, but it is not a major wildlife food plant.

• Slugs and snails can eat emerging shoots: check young growth during damp weather and use barriers or locally approved controls where needed.
• Aphids may cluster on soft shoots: wash them off with water and encourage natural predators.
• Poor flowering often follows winter pruning: retain last year's stems and prune only after flowering.
• Crown or root rot can develop in waterlogged soil: improve drainage and keep mulch away from the stem bases.

All parts are toxic if chewed by people, cats, dogs or horses. Fresh plant material contains irritants that can cause mouth irritation, drooling, vomiting or diarrhoea; serious poisoning is uncommon because it tastes unpleasant. Sap can irritate skin, so wear gloves when pruning.

• Alpine clematis (Clematis alpina)

  Also has nodding spring bells, but typical flowers look simpler, with four prominent outer sepals and a shorter inner centre. Downy clematis has longer, more numerous petal-like inner segments, giving a fuller flower;

• Mountain clematis (Clematis montana)

  Usually a much larger, more vigorous climber with open, nearly flat white or pink flowers rather than nodding, layered blue-purple bells.

Clematis comes from a Greek word for a climbing shoot, while macropetala means large-petalled, referring to the conspicuous petal-like flower parts.

Propagation. Layer a low-growing stem, or take softwood cuttings in late spring to early summer. Species plants can be raised from seed, but germination may be slow and uneven; seedlings from named selections may differ from the parent.

Accepted botanical name

Clematis macropetala

Native range

Amur, China North-Central, Chita, Inner Mongolia, Manchuria, Mongolia and Qinghai.

Measured

Average height 200 cm.

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