Diervilla rivularis Troja Black
Diervilla rivularis Troja Black
Diervilla rivularis Troja Black
Diervilla rivularis Troja Black
Mountain Bush Honeysuckle
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Description
The Diervilla 'Troja Black' is a small bushy plant of interest from spring to autumn due to its changing foliage colour and long summer flowering. Slightly suckering, this close relative of weigelas and honeysuckles likes partial shade and blooms there for several weeks in summer, in clusters of light yellow to orange, enhanced by the purple-green and violet colours of its foliage. The diervilla adapts to all exposures, it can tolerate some drought and the root competition of large trees.
The Diervilla Troja Black is a horticultural selection derived from the Diervilla rivularis, a species native to the understory of the southern United States. This suckering bush of the Caprifoliaceae family has a bushy but spreading habit, with multiple stems originating from the base and the ability to cover the ground quite effectively. When mature, it reaches about 1m (3 ft 4 in) in all directions, with its lateral growth being quite easy to control by removing suckers or by planting other vigorous woodland plants alongside it. Its foliage is composed of oval, elongated, pointed leaves, slightly crinkled and shiny. The leaves are bronze-purple in spring, then partially turn purple-green in summer, before taking on a purple-violet hue in autumn. At the end of the season, the leaves dry up and fall off. Its summer flowering, appreciated by pollinating insects, takes place from July to August-September. Its light yellow flowers tinged with orange, arranged in clusters, will bloom on the previous year's branches, with a lovely purple colour. This diervilla offers abundant flowering, even in shaded areas and in the roots of trees where it particularly thrives. The highly contrasting colours of the foliage and flowers create a striking effect. The Diervilla rivularis is less resistant to drought than its cousin, the Diervilla x splendens, but it can tolerate occasional dry periods.
Low-maintenance, the Diervilla 'Troja Black' is adapted to all exposures and all types of soil, without excessive limestone and not too dry. Its small size is ideal for small gardens, enclosed spaces, or sloping soils. It retains and stabilises slopes thanks to its suckers (underground stems carrying roots). It is also an ideal choice for filling in an undergrowth. It will work very well in a rose garden or in combination with medium-sized perennials such as Japanese anemones or heucheras, and variegated foliage shrubs such as the Ivory Halo dogwood.
Diervilla rivularis Troja Black in pictures
Plant habit
Flowering
Foliage
Botanical data
Diervilla
rivularis
Troja Black
Caprifoliaceae
Mountain Bush Honeysuckle
Cultivar or hybrid
Planting and care
The Diervilla Troja Black is a plant that can grow well in different types of soil and light conditions depending on the area you live in. Cooler areas with full sun will suit this plant, while warmer areas will require partial shade or full shade. The soil should be well-prepared, moist, and rich, but not too dry or chalky. To promote abundant flowering, it's best to prune the branches in late autumn or winter, and to cut the plant shorter every three years.
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).
The flowering period indicated on our website applies to countries and regions located in USDA zone 8 (France, the United Kingdom, Ireland, the Netherlands, etc.)
It will vary according to where you live:- In zones 9 to 10 (Italy, Spain, Greece, etc.), flowering will occur about 2 to 4 weeks earlier.
- In zones 6 to 7 (Germany, Poland, Slovenia, and lower mountainous regions), flowering will be delayed by 2 to 3 weeks.
- In zone 5 (Central Europe, Scandinavia), blooming will be delayed by 3 to 5 weeks.
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 planting period indicated on our website applies to countries and regions located in USDA zone 8 (France, United Kingdom, Ireland, Netherlands).
It will vary according to where you live:
- In Mediterranean zones (Marseille, Madrid, Milan, etc.), autumn and winter are the best planting periods.
- In continental zones (Strasbourg, Munich, Vienna, etc.), delay planting by 2 to 3 weeks in spring and bring it forward by 2 to 4 weeks in autumn.
- In mountainous regions (the Alps, Pyrenees, Carpathians, etc.), it is best to plant in late spring (May-June) or late summer (August-September).
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.
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