Astilbe Planting Guide

June

astilbe this June — what to know

Some notes on astilbe care that hold up no matter where you garden — then check your zone for specifics.

Sun partial shade

Water high

Days to harvest 70–100

Plant depth 1.5″

Spacing 18″

How to water astilbe
Keep the root zone damp for astilbe. Drip irrigation or soaker hoses pay for themselves with this plant.
Where to put astilbe
South-facing beds are ideal for astilbe. Shade from nearby trees or fences costs real production.
Check your local forecast before planting
Your zone determines the exact week to plant astilbe. Pick your county below and we'll line everything up against your frost dates.

Find your zone's astilbe schedule →

Astilbe (Astilbe x arendsii) is a premier perennial for shaded, moist gardens, producing feathery plume-like flower spikes in shades of pink, red, white, and lavender above deeply cut, ferny foliage. Originating in Asia and naturalized in shade gardens worldwide, astilbe thrives where many sun-lovers fail: under trees, beside water features, or in persistently moist woodland borders. The dried flower plumes remain attractive through fall and winter. Different cultivars extend the bloom season from early summer through early fall when several varieties are combined.

Astilbe x arendsii · Flower · Saxifragaceae family · 70–100 days to maturity

Perennial Blooms in Summer Pollinator-friendly Deer-resistant Good for cutting

Why it matters: If you're just starting a flower garden in your area, Astilbe is a forgiving first pick. It tolerates imperfect soil, mild drought, and the occasional missed watering. The reward: weeks (sometimes months) of continuous color.

Get Your Personalized Astilbe Planting Dates

Enter your ZIP code to see exact planting dates, soil compatibility, and growing tips specific to your county.

Where Can You Grow Astilbe?

Zone Compatibility for Astilbe Zones 3a – 8b

1a 1b 2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b 10a 10b 11a 11b 12a 12b 13a 13b

Ideal (data available) Suitable Marginal Not recommended

Planting Dates by Zone

Zone	Start Indoors	Direct Sow	Transplant	Bloom
Zone 3a	Mar 6	—	May 29	Aug 21 – Oct 2
Zone 3b	Mar 1	—	May 24	Aug 16 – Oct 4
Zone 4a	Feb 25	—	May 20	Aug 12 – Oct 7
Zone 4b	Feb 20	—	May 15	Aug 7 – Oct 2
Zone 5a	Feb 21	—	May 9	Jul 25 – Sep 26
Zone 5b	Feb 14	—	May 2	Jul 18 – Sep 26
Zone 6a	Feb 6	—	Apr 17	Jun 26 – Sep 4
Zone 6b	Jan 30	—	Apr 10	Jun 19 – Aug 28
Zone 7a	Jan 21	—	Apr 1	Jun 10 – Aug 5
Zone 7b	Jan 14	—	Mar 25	Jun 3 – Jul 29
Zone 8a	Jan 11	—	Mar 8	May 17 – Jul 5
Zone 8b	Dec 31	—	Feb 25	May 6 – Jun 24

Why are some columns showing "—"?

Direct Sow shows "—" because Astilbe benefits from being started indoors first, then transplanted after the last frost.

How to Plant Astilbe

1.5"

Planting Depth

18"

Between Plants

24"

Between Rows

Growing Conditions

☀️ Sun

Partial Shade (3-6 hours)

💧 Water

High — keep soil consistently moist

Keep soil consistently moist. Mulch heavily to retain moisture.

🧪 Soil pH

6 – 8

Prefers neutral to slightly acidic soil — ideal for most garden beds.

🗺️ Hardiness Zones

Zone 3a – 8b

📅 Days to Maturity

70–100 days

Medium-season crop. Start early for best results in shorter seasons.

👪 Plant Family

Saxifragaceae

Rotate with other families yearly to prevent soil-borne diseases. Don't plant in the same spot where Saxifragaceae family crops grew last year.

Succession Planting Astilbe

Astilbe matures in just 70–100 days, making it ideal for succession planting. In a typical 180-day growing season, you can get up to 2 successive plantings by sowing every 8 weeks.

Your actual succession count depends on your local frost dates. Enter your ZIP code to get personalized succession planting dates for your area.

Companion Planting for Astilbe

✅ Good Companions

Hostas Bleeding Hearts Ferns Columbine Hydrangeas

Check more combinations with our Companion Planting Checker →

Growing Tips for Astilbe

Plant bare-root crowns in spring as soon as the ground is workable, setting eyes 1–2 inches below soil level. Fall planting (Zones 4+) is equally effective. Consistent moisture is non-negotiable — astilbe will wilt and scorch in drought. Amend with generous compost to improve moisture retention. Partial shade (morning sun, afternoon shade) is ideal; deep shade reduces bloom but foliage remains. Fertilize lightly in spring with a balanced slow-release granular. Divide every 3–5 years in early spring as clumps become congested. Leave plumes standing through winter for ornamental interest and wildlife value. Year 2+ plants produce the fullest bloom spikes; first-year crowns may flower lightly or not at all.

Saving Astilbe Seeds

Recommended for Your Garden

🌱

Seed Starting Trays $8-20

Start seeds indoors with reusable cell trays and humidity domes.

🧪

Soil Test Kit $12-25

Test your soil pH, nitrogen, phosphorus, and potassium levels before planting.

🏷️

Garden Plant Markers $6-12

Keep your garden organized with durable, weather-resistant plant labels.

Reader favourite

Seed Saving & Storage Guide

$27 $157 value

Most saved seeds go bad before next season. This shows exactly when to pick, how to dry, and where to store seeds from 200 plants so yours don't.

200 plants, step-by-step: life cycle, pollination type, isolation
Exact temperature + humidity ranges that keep seeds viable
Bonus: searchable Google Sheets tracker + custom GPT assistant

Save a lifetime of seed money →

Astilbe by State

Frequently Asked Questions

How long does it take to grow Astilbe?

Astilbe (Astilbe x arendsii) takes 70 to 100 days from planting to harvest. Exact timing depends on your variety, growing conditions, and USDA zone.

What zones can Astilbe grow in?

Astilbe can be grown in USDA zones 3a through 8b. Use the planting calendar above to find the exact dates for your zone.

How much sun does Astilbe need?

Growing Astilbe requires Partial Shade (3-6 hours), High — keep soil consistently moist, and soil pH of 6 to 8.