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Astilbe Groups

Astilbe, with their feathery plumes of densely packed flowers, are a shade garden's dream. These captivating perennials bring vibrant hues and textural interest to areas where many other flowering plants struggle.  Their versatility shines through in the diverse forms their flower panicles take, ranging from tall and slender spires to dense, bushy plumes, and even cascading sprays, offering a captivating display for any shady nook.

To better understand the unique characteristics of different Astilbe varieties, they are classified into distinct groups, each with its own set of features:

Before delving into the groups, it's important to understand the basic needs of Astilbe.  These shade-loving plants thrive in consistently moist, humus-rich soil. While they prefer dappled sunlight or filtered shade, they can tolerate deeper shade, although flowering may be less prolific.

Simplicifolia Group: This group stands out with its glossy, mid-green foliage, characterized by lobed rather than divided leaves.  The plants form compact mounds that offer visual appeal even when not in bloom.  Their airy panicles of star-shaped flowers give way to ornamental seed heads, extending their visual interest for months.  However, they are slower to establish than other groups, typically taking around 3 years to reach maturity.

Arendsii Group:  This is the most prevalent group of Astilbe found in gardens, comprising over 95% of those sold in the USA.  Developed by renowned German nurseryman Georg Arends, this group features hybrids resulting from crosses between Astilbe chinensis var. davidii, Astilbe astilboides, and members of the Japonica and Thunbergii groups. This diverse parentage results in a wide array of colors, sizes, and bloom times.

Astilbe chinensis: This species is valued for its later bloom time, extending the Astilbe season into late summer.  The foliage is deeply cut, coarsely textured, and often displays a bronze-green hue. Flowers are borne on narrow, branched panicles. While they thrive in moist conditions like other Astilbe, they exhibit moderate drought tolerance. Shorter varieties, such as 'Pumila', make excellent ground covers.

Japonica Group: Known for their early flowering and glossy green leaves, often tinged with red, these Astilbe bring early color to the shade garden. Their flowers are produced in dense, pyramidal clusters, creating a striking visual impact.

Thunbergii Group: This group is distinguished by its late-blooming nature and distinctive open, nodding flower clusters.  The graceful blooms are held on tall stems that rise above the glaucous (bluish-green) foliage.

By exploring these different groups and their unique characteristics, gardeners can select the perfect Astilbe to enhance their shady landscapes with long-lasting color and texture.

  • Astilbe 'Bridal Veil' (4) 1-gallons Astilbe 'Bridal Veil' (4) 1-gallons

    Astilbe 'Bridal Veil' (4) 1-gallons

    Astilbe 'Bridal Veil' ('Brautschleier') (4) 1-gallons Common Name: Astilbe-Hybrid, Spirea Zones 4 to 9. Full sun to full shade. Plants reach 28 inches tall and 18 to 22 inches wide. Clump forming dwarf habit. Growth rate: Moderate, slow spreading,...

    $121.46
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  • Astilbe 'Dark Side of the Moon' (4) 1-gallons Astilbe 'Dark Side of the Moon' (4) 1-gallons

    Astilbe 'Dark Side of the Moon' (4) 1-gallons

    Astilbe 'Dark Side of the Moon' PPAF CPBRAF (4) 1-gallonsProven WinnersCommon Name: Astilbe An instant classic for the landscape! 'Dark Side of the Moon' is the only dark leafed Astilbe with purple flowers that's on the market. Rich deep chocolate...

    $144.85
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  • Astilbe Deutschland 25 BR Plants Astilbe Deutschland 25 BR Plants

    Astilbe 'Deutschland' (25) BR Plants

    Astilbe 'Deutschland' Common Name: Astilbe-Japanese.Zones 4 to 9.Full sun to full shade. Plants reach 24 to 30 inches tall and 18 to 24 inches wide;Clump forming habit. Growth rate: Moderate, slow spreading, rhizomatous plants. Panicles of white, open,...

    $209.05
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  • Astilbe Fanal 25 BR Plants Astilbe Fanal 25 BR Plants

    Astilbe 'Fanal' (25) BR Plants

    Astilbe 'Fanal' (25) Bare Root PlantsCommon Name: Hybrid Astilbe, False Spirea 'Fanal' quickly forms a compact graceful, fern-like mound of dainty foliage topped by bunches of fragrant, bright red tiny flowers; densely packed into erect to...

    $209.05
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  • Astilbe Fanal bare root plant Astilbe 'Fanal' (bare root plant)

    Astilbe 'Fanal' (bare root plant)

    Astilbe arendsii 'Fanal' Bare Root PlantsCommon Name: Hybrid Astilbe, False Spirea 'Fanal' quickly forms a compact graceful, fern-like mound of dainty foliage topped by bunches of fragrant, bright red tiny flowers; densely packed into...

    $4.90
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  • Astilbe Peach Blossom 25 BR Plants Astilbe Peach Blossom 25 BR Plants

    Astilbe 'Peach Blossom' (25) BR Plants

    Astilbe 'Peach Blossom' Common Name: Astilbe-Japanese. Peach flowers with a hint of pink, triangular shaped plumes bloom in early summer. Glossy, green foliage. A member of Astilbe japonica (Japanese Astilbe) , a species characterized by an early bloom...

    $209.05
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  • Astilbe 'Red Sentinel' (25) BR Plants Astilbe Red Sentinel 25 BR Plants

    Astilbe 'Red Sentinel' (25) BR Plants

    Astilbe 'Red Sentinel' (25) Bare Root PlantsCommon Name: Astilbe-Japanese. Scarlet-red flowers are held in open, lacy panicles, triangular shaped plumes bloom in mid-summer. Forest green foliage and mahogany-red stems. A member of Astilbe japonica...

    $209.05
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  • Astilbe Rheinland 25 BR Plants Astilbe Rheinland 25 BR Plants

    Astilbe 'Rheinland' (25) BR Plants

    Astilbe 'Rheinland' (25) Bare Root PlantsCommon Name: Astilbe-Japanese. Rose-pink flowers are held in large, diamond shaped panicles, plumes bloom in early summer. Large, bold, and mid-green, 'Rheinland' is a vigorous, floriferous favorite. A member...

    $209.05
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  • Astilbe arendsii Gladstone bare root plant Astilbe a. 'Gladstone' (bare root plant)

    Astilbe a. 'Gladstone' (bare root plant)

    Astilbe x arendsii 'Gladstone' Bare Root PlantsCommon Name: False Spirea Height: 18-24 Inches Spread: 18-24 Inches Hardiness Zone: 4-8 Part Shade to Shade Deciduous Blooms White - Early Summer Foliage emerges bronze fading to dark green in Summer...

    $4.90
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  • Astilbe Rheinland bare root plant Astilbe Rheinland bare root plant

    Astilbe a. 'Rheinland' (bare root plant)

    Astilbe x arendsii 'Rheinland' Bare Root PlantsCommon Name: False Spirea Height: 18-24 Inches Spread: 18-24 Inches Hardiness Zone: 4-9 Part Shade to Shade Deciduous Blooms pink - Early Summer Foliage green Effective as a shade ground cover in large...

    $4.90
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  • Astilbe chinensis Pumila 25 BR Plants Astilbe chinensis Pumila 25 BR Plants

    Astilbe c. 'Pumila' (25) BR Plants

    Astilbe chinensis 'Pumila' (25) Bare Root PlantsCommon Name: Astilbe- Dwarf Chinese Lilac-pink flowers on fuzzy, stiff plumes. Colorful blossoms are produced atop medium green foliage clump in late summer to early fall; one of the last Astilbes to...

    $222.56
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Astilbe, those feathery plumes of color that brighten up shady gardens. Understanding Astilbe "Groups" is key to choosing the right ones for your garden, as it significantly impacts bloom time, size, and overall appearance.

What are Astilbe Groups (and Why They Matter):

Unlike some genera where cultivars are simply listed individually, Astilbe cultivars are often categorized into hybrid groups. These groups are based on their parentage (the species that were crossed to create them). This grouping is not just taxonomic trivia; it is practical for gardeners because:

  • Bloom Time: Different groups bloom at different times, allowing you to extend the Astilbe season in your garden by planting varieties from multiple groups.
  • Plant Size and Habit: Groups tend to share similar size and growth habits (upright, mounding, etc.), making it easier to plan your garden design.
  • Flower Form: The shape and density of the flower plumes can vary between groups.
  • Foliage Characteristics: Some groups have more distinctive foliage (bronze, deeply cut, etc.).

Description: Astilbes are herbaceous perennials prized for their:

  • Feathery Plumes: The showy, plume-like flower clusters (inflorescences) are made up of hundreds of tiny flowers. These plumes can be upright, arching, or cascading, depending on the variety.
  • Fern-like Foliage: The leaves are compound, often deeply divided, and resemble fern fronds. Foliage color ranges from light green to dark green, with some varieties having bronze or reddish tints, especially when new.
  • Shade Tolerance: They are one of the best flowering perennials for shade, although many can tolerate some sun, especially in cooler climates.

Native Habitat: Astilbes are native to Asia (primarily East Asia, including China, Japan, and Korea) and North America. They are typically found in:

  • Moist woodlands
  • Mountain meadows
  • Along streams and rivers
  • Boggy areas

This native habitat dictates their preference for consistently moist, rich soil and shady conditions.

Taxonomy:

  • Kingdom: Plantae
  • Division: Magnoliophyta (Flowering plants)
  • Class: Magnoliopsida (Dicotyledons)
  • Order: Saxifragales
  • Family: Saxifragaceae (Saxifrage family)
  • Genus: Astilbe

Morphology:

  • Roots: Rhizomatous roots (underground stems that spread horizontally).
  • Stems: Erect stems that bear both leaves and flowers.
  • Leaves: Compound, basal (arising from the base of the plant) and cauline (arising from the stem), with toothed or lobed leaflets.
  • Flowers: Tiny flowers arranged in dense, branched panicles (plumes). The individual flowers are small, but the overall effect of the plume is showy.
  • Fruit: Small capsules containing numerous tiny seeds.

Major Astilbe Groups and Their Differences: Here are the most common Astilbe groups you will encounter, along with their key characteristics:

Arendsii Hybrids:

  • Parentage: Primarily derived from Astilbe japonica, Astilbe astilboides, and Astilbe thunbergii.
  • Characteristics: The most common and diverse group. Generally mid-sized (2-3 feet tall). Bloom in early to mid-summer. Wide range of colors (white, pink, red, lavender). Good all-around performers.
  • Popular Varieties: 'Fanal' (deep red), 'Bridal Veil' (white), 'Amethyst' (lavender-pink), 'Rheinland' (pink).

Japonica Hybrids:

  • Parentage: Primarily from Astilbe japonica.
  • Characteristics: Among the earliest to bloom (late spring to early summer). Tend to be shorter (1-2 feet tall). Dense, compact flower plumes. Glossy foliage. Prefer more moisture than some other groups.
  • Popular Varieties: 'Peach Blossom' (light pink), 'Montgomery' (deep red), 'Deutschland' (white).

Chinensis Hybrids:

  • Parentage: Primarily from Astilbe chinensis.
  • Characteristics: More tolerant of drier conditions and sun than other groups (though still prefer moist shade). Bloom later in the summer (mid to late summer). Often have a more spreading, groundcover-like habit. Flower plumes can be more open and airy.
  • Popular Varieties: 'Pumila' (dwarf, lavender-pink), 'Visions' (raspberry pink), 'Purpurkerze' (purple).

Simplicifolia Hybrids:

  • Parentage: Primarily from Astilbe simplicifolia.
  • Characteristics: Dwarf varieties (usually under 1 foot tall). Delicate, arching flower plumes. Fine-textured foliage. Bloom in mid-summer. Excellent for rock gardens or the front of the border.
  • Popular Varieties: 'Sprite' (light pink), 'Hennie Graafland' (pink).

Thunbergii Hybrids:

  • Parentage: Primarily from Astilbe thunbergii
  • Characteristics: Known for tall (often over 3ft, up to 4ft) and arching flower plumes. Blooms are in mid to late summer.
  • Popular Varieties: 'Straussenfeder' (Ostrich Plume - coral pink), 'Professor van der Wielen' (white).

Crispa Hybrids:

  • Parentage: Derived from various species, displaying a unique characteristic.
  • Characteristics: Dwarf group with crinkled, curled foliage, adding textural interest even when not blooming.
  • Popular Variety: 'Perkeo'

Landscaping Design Tips:

  • Shady Borders: Astilbes are ideal for shady or partially shady borders, woodland gardens, and alongside streams or ponds.
  • Mass Plantings: Planting in groups of 3 or more of the same variety creates a more impactful display.
  • Mixed Borders: Combine them with other shade-loving plants, such as:
    • Hostas
    • Ferns
    • Heucheras (Coral Bells)
    • Tiarella (Foamflower)
    • Pulmonaria (Lungwort)
    • Rodgersia
    • Ligularia
  • Containers: Smaller varieties can be grown in containers but ensure consistent moisture.
  • Cut Flowers: Astilbe plumes make excellent cut flowers, both fresh and dried.

Planting and Care:

  • Soil: Rich, consistently moist, well-drained soil is essential. Amend heavy clay or sandy soils with plenty of organic matter (compost, peat moss).
  • Planting: Plant in spring or fall. Space plants according to the mature size of the variety (check the plant tag). The crown of the plant should be at or just slightly below the soil surface.
  • Watering: Water regularly and deeply, especially during dry periods. Astilbes do not tolerate drought. Mulching helps retain soil moisture.
  • Fertilizing: Apply a balanced, slow-release fertilizer in early spring. Alternatively, top-dress with compost.
  • Deadheading: Removing spent flower plumes can encourage some reblooming (especially in Arendsii hybrids) and keeps the plants looking tidy. However, the dried plumes can also provide winter interest.
  • Pests and Diseases: Astilbes are generally pest and disease-resistant. Slugs and snails may occasionally nibble on the foliage. Powdery mildew can be a problem in humid conditions with poor air circulation.
  • Winter Care: In colder climates, a layer of mulch over the crown after the ground freezes can provide extra winter protection.
  • Division: Divide clumps every 3-4 years in spring or fall to rejuvenate the plants and prevent overcrowding. This also helps maintain vigor and flowering.

Other Insights for Gardeners:

  • Sun Tolerance: While shade-loving, many Astilbes, especially chinensis hybrids, can tolerate more sun, particularly in cooler climates with consistent moisture. Morning sun is generally preferable to hot afternoon sun.
  • Soil pH: Astilbes prefer slightly acidic to neutral soil (pH 6.0-7.0).
  • Deer Resistance: Astilbes are generally considered deer-resistant, although deer may browse them if other food sources are scarce.
  • Rabbit Resistance: They are also considered rabbit resistant.
  • Foliage Interest: Do not overlook the foliage! Many varieties have attractive foliage that provides interest throughout the growing season, even when the plants are not in bloom.

By understanding the different Astilbe groups and their characteristics, you can choose the best varieties for your garden conditions and create a beautiful, long-lasting display of these elegant shade perennials. Remember to prioritize consistent moisture and provide rich, well-drained soil for optimal growth and flowering.

Astilbe FAQ

Astilbe chinensis, commonly known as Chinese Astilbe, is a perennial plant prized for its feathery plumes of flowers and attractive foliage.

It is a popular choice for adding texture and color to shade gardens.

Key features:

  • Flowers: The flowers bloom in mid-to-late summer and come in a variety of colors including pink, red, purple, and white. They are densely packed into plume-like panicles that rise above the foliage.
  • Foliage: The leaves are fern-like, compound, and often have a bronze or reddish tint, especially when young. They provide interest even when the plant is not in bloom.
  • Growth habit: Chinese Astilbe typically grows in clumps, reaching a height of 2 to 3 feet and spreading about 1 to 2 feet wide.
  • Hardiness: It is hardy in USDA zones 4 to 8.
  • Conditions: It thrives in partial to full shade and prefers moist, well-drained soil. It is more tolerant of sun and drought than other Astilbe species.

Cultivation:

  • Planting: Plant in spring or fall, spacing plants about 18 inches apart.
  • Soil: Amend the soil with organic matter to improve drainage and moisture retention.
  • Watering: Water regularly, especially during dry periods, to keep the soil consistently moist.
  • Fertilizing: Fertilize in spring with a balanced fertilizer.
  • Maintenance: Deadhead spent flowers to encourage reblooming and divide clumps every few years to maintain vigor.

Uses:

  • Borders: Chinese Astilbe is a great addition to shady borders and woodland gardens.
  • Mass plantings: It can be planted in masses to create a dramatic effect.
  • Containers: It can also be grown in containers on shady patios or balconies.
  • Cut flowers: The flowers are long-lasting and make excellent cut flowers.

Benefits:

  • Attracts pollinators: The flowers attract butterflies and other pollinators.
  • Deer and rabbit resistant: Deer or rabbits do generally not bother it.
  • Low maintenance: Once established, it requires minimal care.

Popular cultivars:

  • 'Visions': Raspberry pink flowers and compact growth habit.
  • 'Pumila': Deep pink flowers and dwarf size, reaching only 12 to 18 inches tall.
  • 'Purple Lance': Purple flowers and upright growth habit.
  • 'Vision in Red': Deep red flowers and bronze foliage.

Chinese Astilbe is a versatile and beautiful plant that can add a touch of elegance to any shade garden. With its attractive flowers, foliage, and easy-care requirements, it is a popular choice for gardeners of all levels of experience.

The Astilbe Arendsii Group encompasses a wide array of stunning hybrids, renowned for their vibrant plumes of feathery flowers and lush foliage. These hybrids, developed primarily by German horticulturist Georg Arends in the early 20th century, have become a staple in shade gardens worldwide.

Origins and Parentage:

The Arendsii Group resulted from complex crosses involving various Astilbe species, including A. astilboides, A. chinensis, A. japonica, and A. thunbergii. This hybridization led to a diverse group with a broad range of colors, heights, and bloom times.

Key Features:

  • Flowers: Dense, plume-like panicles in a spectrum of colors, including white, pink, red, lavender, and purple. Bloom times typically range from early summer to late summer, depending on the cultivar.
  • Foliage: Fern-like, compound leaves, often with a bronze or reddish tint, adding to the plant's ornamental value even when not in bloom.
  • Growth Habit: Clump-forming perennials with heights varying from 1 to 4 feet, depending on the cultivar.
  • Hardiness: Generally hardy in USDA zones 4 to 8.

Cultivation:

  • Light: Thrive in partial shade to full shade. Some cultivars tolerate more sun if provided with consistent moisture.
  • Soil: Prefer moist, well-drained soil enriched with organic matter.
  • Water: Require regular watering, especially during dry periods, to maintain moist soil consistently.
  • Fertilizer: Benefit from a balanced fertilizer application in spring.
  • Maintenance: Deadhead spent flowers to promote reblooming and divide clumps every 3-4 years to maintain vigor.

Popular Cultivars:

  • 'Fanal': Deep red flowers with bronze-red foliage.
  • 'Amethyst': Lilac-purple flowers.
  • 'Brautschleier': White flowers with a graceful, arching habit.
  • 'Erika': Rose-pink flowers.
  • 'Sister Theresa': Pale pink flowers with dark green foliage.

Landscape Uses:

  • Shade Gardens: Provide vibrant color and texture in shaded borders and woodland gardens.
  • Mass Plantings: Create a dramatic effect when planted in large groups.
  • Water Features: Thrive in moist environments and complement water features like ponds and streams.
  • Containers: Suitable for container gardening, adding interest to patios and balconies.
  • Cut Flowers: Excellent for fresh and dried floral arrangements.

Benefits:

  • Long Blooming Season: Offer an extended period of bloom with cultivars flowering at different times.
  • Attractive Foliage: Provide season-long interest with their fern-like leaves.
  • Low Maintenance: Relatively easy to care for once established.
  • Deer and Rabbit Resistant: Generally unpalatable to deer and rabbits.

The Astilbe Arendsii Group offers a wealth of choices for gardeners seeking to brighten shady areas with their colorful plumes and lush foliage.

Their adaptability, long bloom season, and low maintenance make them a valuable addition to any garden.

The Astilbe Japonica Group, also known as Japanese Astilbe, is a captivating collection of hybrids celebrated for their early bloom times, compact growth habits, and vibrant flower plumes. These hybrids, with their origins tracing back to Astilbe japonica, bring a touch of elegance and color to early summer gardens.

Key Features:

  • Flowers: Dense, pyramidal panicles held upright above the foliage. The flowers come in a range of colors, including white, pink, red, and peach. Bloom time is typically early summer, often a few weeks earlier than other Astilbe groups.
  • Foliage: Glossy, dark green leaves, often tinged with bronze or red, particularly in spring. The foliage remains attractive throughout the growing season.
  • Growth Habit: Compact and mounding, typically reaching heights of 1 to 2 feet.
  • Hardiness: Hardy in USDA zones 4 to 8.

Cultivation:

  • Light: Thrive in partial shade to full shade. Some cultivars can tolerate morning sun but prefer protection from the harsh afternoon sun.
  • Soil: Prefer moist, well-drained soil rich in organic matter.
  • Water: Consistent moisture is crucial, especially during dry periods. Water regularly to keep the soil evenly moist.
  • Fertilizer: Benefit from a balanced fertilizer application in spring.
  • Maintenance: Deadhead spent flower plumes to encourage reblooming and divide clumps every 3-4 years to maintain plant vigor.

Popular Cultivars:

  • 'Deutschland': White flowers and compact growth.
  • 'Montgomery': Deep red flowers and bronze-tinged foliage.
  • 'Rheinland': Pink flowers and glossy green leaves.
  • 'Ellie': Soft pink flowers with a compact habit.
  • 'Peach Blossom': Peach-colored flowers.

Landscape Uses:

  • Borders: Ideal for adding early season color to shaded borders and woodland gardens.
  • Mass Plantings: Create a striking display when planted in groups.
  • Containers: Well-suited for container gardening, bringing beauty to patios and balconies.
  • Cut Flowers: Excellent for fresh flower arrangements.

Benefits:

  • Early Bloom Time: Extend the Astilbe bloom season by flowering earlier than other groups.
  • Compact Habit: Fit well in smaller gardens and containers.
  • Attractive Foliage: Provide season-long interest with their glossy leaves.
  • Low Maintenance: Relatively easy to care for once established.

The Astilbe Japonica Group offers gardeners a fantastic selection of compact, early-blooming Astilbes that bring vibrant color and texture to shady gardens. Their adaptability, attractive foliage, and low maintenance make them a popular choice for both novice and experienced gardeners.

The Astilbe Simplicifolia Group distinguishes itself from other Astilbe groups with its delicate, star-shaped flowers, compact growth habit, and graceful foliage. These hybrids, derived from Astilbe simplicifolia, offer a unique charm, and add a touch of understated elegance to shade gardens.

Key Features:

  • Flowers: Open, airy panicles of small, star-shaped flowers, typically in shades of white, pink, or light red. Bloom time is generally mid-to-late summer.
  • Foliage: Glossy, deeply lobed leaves, often with a bronze or reddish hue, forming attractive mounds of foliage even when not in bloom.
  • Growth Habit: Compact and mounding, typically reaching heights of 1 to 1.5 feet.
  • Hardiness: Hardy in USDA zones 4 to 8.

Cultivation:

  • Light: Thrive in partial to full shade. They prefer protection from the harsh afternoon sun.
  • Soil: Prefer moist, well-drained soil enriched with organic matter.
  • Water: Require consistent moisture, especially during dry periods. Water regularly to maintain evenly moist soil.
  • Fertilizer: Benefit from a balanced fertilizer application in spring.
  • Maintenance: Deadhead spent flower plumes to tidy the plant's appearance and divide clumps every 3-4 years to maintain vigor.

Popular Cultivars:

  • 'Sprite': Shell pink flowers and bronze-tinged foliage.
  • 'Aphrodite': Salmon-red flowers.
  • 'Bronze Elegance': Rose-pink flowers with bronze foliage.
  • 'White Sensation': White flowers and dark green foliage.

Landscape Uses:

  • Borders: Add a delicate touch to shaded borders and woodland gardens.
  • Rock Gardens: Their compact size makes them suitable for rock gardens.
  • Containers: Well-suited for container gardening, adding interest to patios and balconies.
  • Ground Cover: Some cultivars can be used as a ground cover in shady areas.

Benefits:

  • Delicate Beauty: Offer a unique charm with their star-shaped flowers and graceful foliage.
  • Compact Size: Fit well in smaller gardens and containers.
  • Attractive Foliage: Provide season-long interest with their glossy leaves.
  • Low Maintenance: Relatively easy to care for once established.

The Astilbe Simplicifolia Group provides gardeners with a distinctive collection of Astilbes that bring an understated elegance to shade gardens. Their compact size, attractive foliage, and delicate flowers make them a valuable addition to any garden seeking a touch of refined beauty.

The Astilbe Thunbergii Group stands out with its graceful, arching plumes and late summer bloom time. These hybrids, originating from Astilbe thunbergii, offer a unique texture and airy elegance to the shade garden, extending the Astilbe season with their later flowering display.

Key Features:

  • Flowers: Drooping or arching panicles, often with a more open and delicate structure compared to other groups. Flower colors include white, pink, and red. Bloom time is typically late summer, extending into early fall.
  • Foliage: Often features a bluish-green or grayish-green hue (glaucous), providing a contrasting backdrop for the colorful flower plumes.
  • Growth Habit: Typically reaches heights of 2 to 3 feet, with a spreading habit.
  • Hardiness: Hardy in USDA zones 4 to 8.

Cultivation:

  • Light: Thrive in partial shade to full shade. They prefer protection from harsh afternoon sun.
  • Soil: Prefer moist, well-drained soil enriched with organic matter.
  • Water: Require consistent moisture, especially during dry periods. Water regularly to maintain evenly moist soil.
  • Fertilizer: Benefit from a balanced fertilizer application in spring.
  • Maintenance: Deadhead spent flower plumes to maintain a tidy appearance and divide clumps every 3-4 years to ensure plant vigor.

Popular Cultivars:

  • 'Straussenfeder' (Ostrich Plume): Rose-pink plumes with a pronounced arching habit.
  • 'Professor van der Wielen': White flowers with a cascading effect.
  • 'Red Straussenfeder': Deep red plumes with an arching form.

Landscape Uses:

  • Borders: Add late-season color and texture to shaded borders and woodland gardens.
  • Water Features: Their graceful, arching plumes complement water features like ponds and streams.
  • Mass Plantings: Create a dramatic effect when planted in groups.
  • Cut Flowers: Their unique form adds interest to fresh flower arrangements.

Benefits:

  • Late Bloom Time: Extend the Astilbe bloom season by flowering later than other groups.
  • Graceful Plumes: Offer a unique, airy texture with their arching or drooping flower panicles.
  • Attractive Foliage: Provide season-long interest with their distinctive foliage color.
  • Low Maintenance: Relatively easy to care for once established.

The Astilbe Thunbergii Group provides gardeners with an elegant and distinctive option for late-season color in the shade garden. Their graceful plumes, attractive foliage, and adaptability make them a valuable addition to any landscape.