Sorbus scalaris
Sorbus scalaris
Sorbus scalaris
Ladder Leaf Rowan, Fern-leafed Sorbus, Chinese Mountain Ash
Very pleased to have found these quite rare plants on the market, Sorbus scalaris and dodong. Fast delivery, plants in impeccable condition. Pleasant surprise. We will wait for the growth in spring, but it looks promising!
Henry , 27/11/2024
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Description
The Sorbus scalaris, also known as the Alternate-leaved Rowan, is a beautiful botanical species native to the mountains of southwest China. Still relatively unknown to gardeners, this modestly-sized tree offers an elegant silhouette, generous white flowering in spring, decorative fruiting, and gorgeous autumn colours. Elegant and ornamental for eight months of the year, and beautifully coloured at the end of the season, this small rowan tree is ideal for small gardens or in large landscaped areas.
The Sorbus scalaris belongs to the Rosaceae family. This small tree grows in forests in the west of Sichuan and Yunnan, at altitudes between 1600 and 3000 m (5249 and 9842ft), and is perfectly hardy. Its habit is spreading, with a fairly short vertical trunk topped by an open, flared crown. With a moderately fast growth rate, it will reach approximately 4 m (13ft) in height and 3 m (10ft) in width at maturity. The deciduous foliage appears in spring and falls in autumn. It is composed of long pinnate leaves arranged alternately. Each leaf is composed of numerous narrow, slightly leathery leaflets, shiny on the upper surface. The summer foliage is dark green. In autumn, it takes on magnificent rust colour, then red, and finally purple hues. From May to June, a multitude of small white honey-scented flowers appear in dense, wide clusters. In September, they give way to beautiful clusters of bright orange fruits that turn red when mature, remaining decorative until winter. These 1 cm (1in) diameter berries are a delight for birds, especially thrushes, who love them.
This charming alternate-leaved rowan, with its moderate growth, is well suited to small gardens as well as larger spaces. Its ornamental qualities make it a perfect choice near the house, either as a standalone specimen or in a mass planting. However, beware of its fruits, as they may stain the patio! It can also be used in the background of flower beds, alone or mixed with other species with autumn foliage, such as Prunus, hazels, caramel trees, parrotias, or maples. Tall grasses like Miscanthus, a Rhamnus frangula Asplenifolia, and a few orange Helianthus or chrysanthemums look fantastic until late in the season. Rowan trees have shallow roots, and it is not uncommon to see a mature tree toppled by a storm. Therefore, avoid placing it too close to buildings and in exposed locations.
Sorbus scalaris in pictures
Plant habit
Flowering
Foliage
Botanical data
Sorbus
scalaris
Rosaceae
Ladder Leaf Rowan, Fern-leafed Sorbus, Chinese Mountain Ash
China
Planting and care
The Sorbus scalaris is preferably planted in autumn. It thrives in the sun but can be in partial shade for the day. It is a small tree that doesn't like scorching exposure or excessive heat. Place it sheltered from prevailing winds to prevent uprooting. It appreciates deep, humus-rich soil that is moist but well-drained and not too chalky. Water it during very dry periods. Remove dead wood or diseased branches. At the end of winter, prune, if necessary and before vegetation resumes, the inner branches that cross and keep only the vigorous branches to maintain the proper habit of the tree.
Mites, aphids, and scale insects are the main enemies of the Sorbus scalaris. Powdery mildew and sooty mould can also affect this tree.
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).
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 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.
The harvest period stated on our website applies to regions in USDA zones 8b to 9a (East, South-East and southern coast: Eastern Leinster, County Wexford and County Waterford, Cork region: Dublin, Wexford, Waterford, Kilkenny, Cork). It will vary depending on where you live:
- In the Midlands and the inland plains: the Middle Shannon Valley, Westmeath, Offaly, Longford, Cavan and Monaghan (Athlone, Mullingar, Tullamore, Longford, Cavan, Monaghan), in USDA zones 8a to 8b, the harvest will be delayed by 1 to 2 weeks compared with the dates given. Far from the moderating influence of the sea, these plains experience late frosts right up until the end of spring. The heavy, peaty soils warm slowly here, and damp patches form pockets of frost. Wait until the soil has dried out and warmed up before planting, and protect young plants with a fleece on clear nights.
- In the Atlantic West and North-West: Kerry, Clare, Galway, Connemara, Mayo, Sligo and Donegal (Killarney, Ennis, Galway, Westport, Sligo, Letterkenny), in USDA zones 8b to 10a, the harvest will be delayed by 1 to 3 weeks compared with the dates given. Summers here are cloudier, rainier and windier than in the east, which slows down ripening and encourages late blight and other fungal diseases. Kerry and Clare are at the lower end of the range, whilst Mayo and Donegal, which are cooler and more exposed, are at the upper end. However, the mild coastal winters mean that leafy vegetables and root vegetables can be harvested at dates close to those indicated, or even earlier: shelter crops from the wind with hedges and grow heat-loving plants in greenhouses or polytunnels.
- In the highlands, above 200 m: the Wicklow Mountains, Macgillycuddy’s Reeks, the Galtee and Comeragh ranges, the Twelve Bens in Connemara and the Donegal highlands, in USDA zones 7b to 8a, the harvest will be delayed by 2 to 4 weeks compared with the dates given, depending on the altitude, taking care to beat the first early frosts, which may occur as early as the start of autumn. Wind, constant damp and late frosts lasting into early summer significantly shorten the growing season. Opt for sheltered, south-facing slopes, early-maturing varieties and growing under cover.
Depending on your garden’s aspect, these variations can range from one to two weeks. A frost-prone valley floor delays the harvest, whilst a south-facing wall brings it forward.
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