Clethra alnifolia
Clethra alnifolia
Clethra alnifolia
Clethra alnifolia
Panicled White Alder, Sweet Pepper Bush
The plant arrived at its destination very well packaged and in good condition... despite the delay caused by the Colissimo delivery deadline not being met... The shrub established well, with rapid growth followed by abundant flowering. Although planted in shade, some of its leaves suffered a little from the August heatwave, but new leaves then appeared in September. I am very satisfied with the purchase of this plant (Clethra alnifolia), which is fairly little known and uncommon.
Flora, 01/10/2024
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Description
The Clethra alnifolia is a bush of the undergrowth, compact, appreciated for its late flowering in clusters of small scented white flowers and its golden yellow foliage in autumn.
Originally from the eastern United States, this sucker-forming bush forms a compact, upright habit, reaching a height of 1.50m (4 ft 11 in) to 2.50m. It bears obovate leaves, deciduous, glossy, alternate, serrated that are 5 to 10 cm (2 to 3.9 in) long, tender green when ripe and golden yellow in autumn. In September, it produces beautiful clusters of flowers of 8 to 15 cm (3.1 to 5.9 in) high, formed by small campanulate flowers, white, downy and highly fragrant.
Hardy down to -15°C (5 °F), the Clethra alnifolia grows in fresh, light, well-drained, acidic soil in a semi-shaded position. The addition of leaf mould at planting is necessary. It can also be grown in ericaceous soil. Remove faded flowers and, in winter, remove old stems.
The Clethra alnifolia is ideal in ericaceous soil flower beds or at the base of large deciduous trees. It also tolerates growing in a pot, making it suitable for filling a terrace or patio.
Clethra alnifolia in pictures
Plant habit
Flowering
Foliage
Planting and care
The Clethra alnifolia, hardy up to -15°C (5 °F), is preferably planted in spring, in fresh, light, well-drained, acidic soil in semi-shaded position. Adding leaf mould at planting is necessary. It can also be grown in ericaceous soil. Remove faded flowers and, in winter, remove old stems. It is naturally resistant to diseases and parasites.
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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