Astilbe brings colour to the shade
Astilbe, sometimes called false spirea, is a perennial favourite among gardeners looking to add a splash of colour and texture to shaded or partially shaded areas of their garden. With its feathery plumes and lush, fern-like foliage, astilbe creates a striking contrast against the greenery of a shaded landscape.
Planting and growing astilbe
Site. Astilbe prefers a location with partial to full shade, making it an ideal choice for gardens with dappled sunlight or areas shaded by trees and shrubs. While it can tolerate some morning sun, too much direct sunlight can scorch its delicate leaves.
Soil. This plant flourishes in well-drained, organically rich soil. To achieve the best results, amend your garden soil with compost or well-rotted manure before planting. Astilbe also prefers a slightly acidic to neutral pH, between 6.0 and 7.0.
Placement. Space astilbe plants about 12 to 18 inches apart to allow for adequate air circulation and room for growth. Plant them at the same depth they were in their nursery pots, ensuring the crown is just at or slightly below the soil surface.
Watering. Astilbe thrives in consistently moist soil. During the growing season, water regularly to keep the soil evenly moist but not waterlogged. Mulching around the plants can help retain moisture and keep the roots cool. If you live in a dry area and don’t like to water… look for a different plant.
Fertilizing. A balanced, slow-release fertilizer applied in the spring can support robust growth and vibrant blooms. Alternatively, an application of compost in the fall can provide nutrients as it decomposes over the winter.
Deadheading. While deadheading is not necessary for astilbe, removing spent flower spikes can help maintain a tidy appearance. If you like, in late fall, after the foliage has died back, cut the plants down to just above the ground. This helps reduce the risk of pests and diseases overwintering in the garden. Personally, I leave my dead plants through the winter.
Dividing. Astilbe benefits from division every three to four years to prevent overcrowding and to rejuvenate the plants. Early spring or fall is the best time to divide astilbe. Simply dig up the clump, separate the rhizomes, and replant them at the appropriate spacing.
Common astilbe problems and solutions
Astilbe is generally pest-resistant, but it can occasionally fall prey to common garden pests such as slugs and snails. These can be managed with organic slug pellets or by setting up beer traps. Ensuring good air circulation around the plants can help prevent powdery mildew, a potential fungal issue in humid conditions.
Astilbe design ideas for shade gardens
Astilbe goes beautifully with other shade-loving plants such as hostas, ferns, and heucheras. It also pairs well with spring bulbs like daffodils and tulips, which provide early-season colour before the astilbe comes into bloom. In a woodland garden setting, astilbe’s naturalistic appearance enhances the landscape’s serene and tranquil vibe.
Recommended astilbe varieties for Canadian gardens
Most of the astilbe we plant originated in China, Japan and Korea; there are none native to Canada or the Western world. They are widely hybridized.
All of the plants below are hardy to Zone 4 (but grow well in my Zone 3 garden).
- ‘Dark Side of the Moon’. Chocolatey coloured leaves with purple buds that open to a rosy hue. Height: 24 to 28 inches. This astilbe will be the 2026 Perennial of the Year.
- ‘Bridal Veil’. Creamy white blooms with delicate spires. Height: 18 to 22 inches.
- ‘August Light’. Bright red flowers. Height: 15 to 24 inches.
- ‘Purple Candles’. Deep violet buds lightening to lavender. Height: 18 to 24 inches.
- ‘Little Vision in Pink’. Fuzzy pink blooms. Compact height: 14 to 16 inches.
- ‘Vision in Red’. Red buds turning pink. Height: 15 inches in bloom.
- ‘Delft Lace’. Salmon-pink buds opening to apricot. Height: 24 inches.
- ‘Deutschland’. Clear white fuzzy blooms. Height: 24 to 30 inches.
