Species
Astilbe x arendsiiArends' Astilbe12 other cultivars
‘Rheinland’Rheinland Astilbe
‘Maggie Daley’Maggie Daley Astilbe
‘Purple Candles’Purple Candles Astilbe
‘Delft Lace’Astilbe Delft Lace
‘Montgomery’Montgomery Astilbe Astilbe Montgomery
‘Dark Side of the Moon’Astilbe Dark Side of the Moon
‘Milk and Honey’Milk and Honey Astilbe
‘Visions in White’Visions in White Astilbe
‘Deutschland’Deutschland Astilbe
‘Sprite’Sprite Astilbe Dwarf Astilbe
‘Vision in Red’Vision in Red Astilbe Red Astilbe
‘Hennie Graafland’Hennie Graafland Astilbe
The Story
Plant Bio
Astilbe x arendsii 'Amethyst' is known for its striking purple flowers and attractive fern-like foliage.
This cultivar is noted for its rich amethyst color, which stands out in the garden.
Uses & Benefits:
Essentials
At a Glance
Plant Type
Perennial
Height
36 inches
Width
24 inches
Light
Partial Sun, Shade
Zones
4, 5, 6, 7, 8
Water
Consistently moist soil
Humidity
Prefers humid environments
Lifespan
Perennial
Native To
Garden origin
Toxicity
Non-toxic to humans and pets
Bloom period
Mid-summer – Late summer
In flower about 2 months of the year
Marketplace
Where to Buy
Shipping costs Year-round shipping Free shipping
Planting
How to Grow
- Choose a shaded location with well-draining, rich, moist soil.
- Tuck seedlings or divisions into prepared soil, spacing 12-18 inches apart.
- Mist cuttings regularly to maintain humidity and promote rooting.
- Mulch around plants to retain moisture and suppress weeds.
- Water consistently, especially during dry spells, for healthy growth.
- Fertilize in early spring with a balanced, slow-release fertilizer.
Pro Tip
Amethyst astilbe thrives in consistent moisture; keep soil evenly moist for best blooms.
Keep It Thriving
Care Guide
Do
- Keep soil consistently moist 🌱
- Provide filtered or partial shade
- Mulch to retain soil moisture
- Fertilize in spring with a balanced fertilizer
- Divide plants every 3-4 years to promote vigor
Don't
- Avoid waterlogging, which can cause root rot ❌
- Don’t expose to direct, harsh sunlight
- Skip fertilizing in late fall
- Don’t forget to remove spent flower stalks after blooming
Seasonal Care Calendar
| Task | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Divide | ||||||||||||
| Mulch | ||||||||||||
| Plant | ||||||||||||
| Spring Cleanup |
Watch Out For
Pests & Diseases
Common Pests
Common Diseases
In the Garden
Landscape Uses & Companions
Landscape Uses
Companion Plants
Multiply
Propagation Methods
Good to Know
Common Questions
Amethyst Astilbe questions
What zones can Amethyst Astilbe grow in?
Amethyst Astilbe is hardy in USDA Zones 4–8. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.
Is Amethyst Astilbe deer resistant?
Yes — Amethyst Astilbe is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.
When does Amethyst Astilbe bloom?
Amethyst Astilbe typically blooms in mid-summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.
Does Amethyst Astilbe need full sun?
Amethyst Astilbe does best in part shade.
More Astilbe to compare
Visions Astilbe
Astilbe chinensis 'Visions'
'Visions in Pink' Chinese Astilbe
Astilbe astilbe 'Visions in Pink'
Garden Astilbe, False Spirea
Astilbe astilboides 'Garden Mix'
Bridal Veil Astilbe
Astilbe astilbe 'Bridal Veil'
Rheinland Astilbe
Astilbe x arendsii 'Rheinland'
Peach Blossom Astilbe
Astilbe astilbe 'Peach Blossom'
Keep exploring
Explore the genus
Hardy in your zone?
Grow Amethyst Astilbe with confidence
See it in a design of your actual yard, get zone-matched care reminders, and track it season by season in your garden journal.