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Astilbe japonica 'Red Sentinel'

Astilbe japonica Red Sentinel
Japanese Astilbe, False Spirea

4,2/5
5 reviews
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This young plant has burned in the sun. I'm trying to heal it in the shade and with plenty of water.

Josseline, 01/07/2019

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This plant carries a 12 months recovery warranty

More information

Perennial of heavy and/or moist soil. Mid-early flowering in short, feathery scarlet panicles. Excellent flowers for cutting and dried bouquets.
Flower size
20 cm
Height at maturity
60 cm
Spread at maturity
40 cm
Exposure
Sun, Partial shade
Hardiness
Hardy down to -34°C
Soil moisture
Moist soil, Damp soil
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Best planting time March to April, September to October
Recommended planting time February to April, September to November
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Flowering time July to August
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Description

Astilbe japonica 'Red Sentinel' is a mid-early flowering Japanese hybrid. From July, its scarlet red flowers gathered in short, well-branched and dense panicles will brighten up the surroundings of water features and shady areas of the garden. In a large pot kept fresh, it will thrive on the terrace. Its feathery panicles remain very attractive in cut flowers or in dried bouquets. The foliage takes on beautiful hues in autumn.

 

 

Astilbe japonica 'Red Sentinel' is a rhizomatous perennial plant, which, from spring, has a low and compact habit with deciduous, compound foliage that is dense and glossy, with dentate leaflets, dark green. It reaches a height of 60cm (24in) when in flower, and spreads to 30 to 40cm (12 to 16in). A long-lived plant, it belongs to the saxifrage family. It is one of the many hybrids whose type species is native to the Japanese archipelago.

 

Plant Astilbe japonica in moist to fresh, rich, neutral to acidic soil. This hybrid does not tolerate lack of water. The plant adapts well to clay soils, if they are healthy and well amended. Note that Astilbes do not tolerate being flooded in winter. Plant Astilbe japonica in partial shade or in a non-burning sunny location: in nature, these plants grow in humid undergrowth. Daily watering will be necessary in hot summers.

 

Astilbe japonica can easily be grown in pots, as an evaporating plant, in flower beds, as edging, as cut flowers and dried flowers. In undergrowth, to create a screen as a hedge, and of course in borders. Combine them with Hostas, Ferns (Athyrium filix-femina), Arums, Cape Fuchsia (Schizostylis coccinea) and Meadowsweet (Filipendula) or other wet soil perennials.

Astilbe japonica 'Red Sentinel' in pictures

Astilbe japonica 'Red Sentinel' (Flowering) Flowering
Astilbe japonica 'Red Sentinel' (Foliage) Foliage
Astilbe japonica 'Red Sentinel' (Plant habit) Plant habit

Flowering

Flower colour red
Flowering time July to August
Inflorescence Panicle
Flower size 20 cm
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Deciduous
Foliage colour dark green

Plant habit

Height at maturity 60 cm
Spread at maturity 40 cm
Growth rate normal

Botanical data

Genus

Astilbe

Species

japonica

Cultivar

Red Sentinel

Family

Saxifragaceae

Other common names

Japanese Astilbe, False Spirea

Origin

Cultivar or hybrid

Other Astilbe - False Goatsbeard

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Planting and care

Astilbe japonica 'Red Sentinel' thrives primarily in partial shade. You can place it under mild sunlight, but avoid the hot midday hours. It is a trouble-free plant. Plant it in spring or autumn in a cool, moist, well-drained soil, rich in organic matter. It is a perennial that prefers fertile soils. You can place it in a marshy area. Do not place it in a limestone soil as it is susceptible to drying out. To plant your young plant, work the soil in a 20cm (8in) cube, crumble the soil well and place a base amendment such as dried blood or dehydrated horn at the bottom of the planting hole. Position your plant, removed from its pot, covering the top of the root ball with 3cm (1in) of soil. Then fill in and water generously to eliminate air pockets. In dry weather, water regularly for a few weeks to facilitate root development. Astilbe require very little maintenance. Keep the soil moist and add compost and fertilizer in spring. In winter, be careful of the flowers and young foliage, which can be damaged by spring frosts. After flowering, trim the flower stems to highlight the foliage. In November, cut the plants back to about 10cm (4in). Avoid working the soil near these plants, as the rootstocks develop on the surface. These plants are resistant to diseases and are rarely attacked by insects. Ignored by slugs, they can be susceptible to powdery mildew and fungal spots.

Planting period

Best planting time March to April, September to October
Recommended planting time February to April, September to November

Intended location

Suitable for Shaded rockery, Woodland edge, Undergrowth
Type of use Border
Hardiness Hardy down to -34°C (USDA zone 4) Show map
Ease of cultivation Beginner
Planting density 5 per m2
Exposure Sun, Partial shade
Soil pH Acidic, Neutral
Soil type Clayey (heavy), Silty-loamy (rich and light)
Soil moisture Moist soil, Damp soil, Rich, clayey

Care

Pruning instructions Prune the faded flowers after flowering to promote better foliage development. You can also leave the flower stems in place if you wish to decorate the garden during the winter season, simply removing everything in the following spring by cutting back the young plant to 10cm (4in).
Pruning Pruning recommended once a year
Pruning time March, November
Disease resistance Good
Overwinter Can be left in the ground
4,2/5

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