Clematis Madame Blanc
Clematis Madame Blanc
Clematis 'Zo24005' Madame Blanc
Large-flowered clematis
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Description
Clematis Madame Blanc (‘Zo24005’) belongs to the group of early large-flowered clematis or Patens hybrids, sought after for their decorative flowering in early summer. Not very tall, but floriferous, this small climber will adorn trellises, arches, and shrubs. Its pure white flowering brightens up partially shaded scenes, and its compact size also suits urban gardens. A compact alternative to the great white classics, ideal for small spaces or terraces.
A climbing plant from the Ranunculaceae family, this ‘Zo24005’ cultivar is marketed under the name Madame Blanc. The breeder is the J. van Zoest nursery located in Boskoop, the Netherlands. It is a climbing plant that clings via its petioles. In the ground, it reaches approximately 2m in height with a spread of 0.80m to 1m; in a pot, its growth remains a little lower. The medium green foliage is deciduous, divided into ovate to lanceolate leaflets. The main flowering period is from June to July; the flowers are single, 10 to 12 cm in diameter, composed of 6 broad, entirely white tepals surrounding a cluster of cream to pale yellow stamens. If lightly pruned out after the first flowering, the plant may flower again in late summer. Its is hardy to around −20 °C.
Plant this small Clematis Madame Blanc in morning sun or partial shade, with the base shaded by low-growing perennials, on a trellis, arch, or a shrub with light foliage. To grow it in a container, use a pot 35–40 cm in diameter. Pair ‘Madame Blanc’ with red climbing roses for contrast or with variegated dogwoods, compact lilacs, not very tall Fargesia bamboos... Combine it with other white clematis like ‘Huldine’, ‘Guernsey Cream’ or ‘Henryi’ to extend the flowering period of your display, or with ‘Prince Charles’ to create a blue counterpoint.
Plant habit
Flowering
Foliage
Botanical data
Clematis
'Zo24005' Madame Blanc
Ranunculaceae
Large-flowered clematis
Cultivar or hybrid
Planting and care
Plant Clematis Madame Blanc ‘Zo24005’ in spring or early autumn in loose, humus-bearing, and well-drained soil, burying the collar 3 to 5 cm deep to encourage the emergence of new stems; tilt the root ball 10–15° towards the support and provide a trellis of wires or sticks 5–10 mm thick that the petiolate leaves can grasp. Space about 60–80 cm apart from other climbing plants, water at planting and regularly in the first year without waterlogging the soil; mulch the base or shade it with low-growing perennials to retain coolness.
In a pot with a minimum diameter of 35–40 cm, use a mixture of garden soil + mature compost + mineral drainage material, water thoroughly, then allow to drain, and protect the root ball from severe frost in winter by insulating the container.
Apply a layer of compost in spring and, if needed, a low-nitrogen organic fertiliser; avoid severe pruning.
Regularly guide the young stems, monitor excess water, aerate the foliage to limit powdery mildew. In case of clematis wilt, cut cleanly below the affected area to restart growth from the crown.
Planting period
Intended location
Care
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
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In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.
The planting period indicated on our website applies to regions in USDA Zone 9a (East Coast and Midlands: Dublin, Wexford, Waterford, Kilkenny, Portlaoise). It will vary depending on where you live:
- On the west coast and in the north-west (Galway, Limerick, Sligo, Donegal, Westport), delay planting by 1 to 2 weeks in spring and bring it forward by 1 to 2 weeks in autumn compared to the dates given, preferably choosing periods without strong winds.
- In the inland hills and plateaus (Wicklow Mountains, Macgillycuddy’s Reeks, Connemara, Killarney), it is best to plant in spring (April–May) or autumn (September–October), avoiding periods of waterlogged soil in winter and strong winds, which pose the main risk to newly planted trees in these areas.
The flowering period indicated on our website applies to regions in USDA Zone 9a, such as the East Coast and Midlands, including Dublin, Wexford, Waterford, Kilkenny and Portlaoise.
This will vary depending on where you live:
- On the west coast and in the northwest (Galway, Limerick, Sligo, Donegal and Westport), it will be delayed by one to two weeks compared to the given dates, due to stronger Atlantic winds and less spring sunshine.
- In the inland hills and plateaus (the Wicklow Mountains, the Macgillycuddy's Reeks, Connemara and Killarney), flowering will be delayed by two to three weeks. Flowering mainly occurs between May and July, with the limiting factors being less frost and more of the excessive humidity, strong winds and lack of sunshine that are characteristic of these areas.