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Planting and Growing Astilbes

Astilbe plant with pink feathery plumes of flowers growing in the garden

Image Credit:
J. Kumpinovica/Shutterstock
Botanical Name
Astilbe
Grown as
Perennial
USDA Zones
3a
3b
4a
4b
5a
5b
6a
6b
7a
7b
8a
8b
9a
9b
Toxicity
Non-toxic
Sun Exposure
Partial Sun
Partial Shade
Shade
Water Needs
Moderate
Height
1–3 feet
Spread
1–3 feet
Soil pH
Neutral
Bloom Time
Spring
Summer
Flower Color
Pink
Red
White
Special Features
Container-Friendly
Cut Flower
Disease-Resistant
Low Maintenance
Attracts Butterflies
Attracts Pollinators
Deer-resistant
Rabbit-resistant
Resilience
Clay Soil Tolerant
Cold Hardy
Plant Type
Flowers
Written By: Catherine Boeckmann Executive Digital Editor and Master Gardener

Meet astilbe—a shade garden favorite, with colorful plume-like blooms, ferny foliage, and a hardy disposition that’s sure to make this easy-going perennial your newest feathery friend. 

If you’re looking for a deer-proof plant with a long bloom time and tolerance for moisture, shade, and cold, here’s what makes astilbes stand out and how to keep these plants in flower beds, garden borders, or containers!

Planting

When to Plant Astilbe

Most growers cultivate astilbe from nursery starts, which are best planted in spring or fall. Growing these plants from seed can be tricky, but you can also produce new astilbe from dividing established plants in early spring.

Multicolored astilbe plants in garden
Astilbes come in many beautiful colors!
Photo: znmysteryPhoto

Where to Plant Astilbe

Astilbes prefer light to moderate shade, while deep shade can reduce flowering and full sun may burn the plant’s tender leaves. Although astilbes love moist, damp soil, they still need proper drainage and should not be grown in areas where water puddles for long periods of time. For optimal growth, amend the soil with compost or aged manure before planting astilbes to boost soil nutrient levels and improve drainage too.

If desired, you can also grow astilbes in well-draining pots that are at least 16 inches wide, or plant them in garden borders or use them as a flowering ground cover.

How to Plant Astilbe

Plant nursery starts about 1 to 3 feet apart, depending on the variety. To plant, loosen the soil to about 10 to 12 inches deep with your shovel, mix in a touch of compost, set the plant’s crown (where the roots and stems connect) just below the soil line, backfill the hole with soil, and water well.

If you’re growing bare-root plants instead, dig a hole that’s twice as wide as the plants’ roots and 4 to 6 inches deep. Place the plant so the roots are fanned out slightly and pointing downwards with the crown located 1 to 2 inches below the soil line, then cover the roots with soil, press firmly, and water your new astilbes in.

Growing

Watering 

Astilbes grow best when their soil is kept evenly moist. During dry spells, water these plants deeply at the soil line.

Fertilizing

Producing big blooms takes energy and astilbes tend to be heavy feeders. To boost flowering, fertilize these plants twice a year in spring and fall with a balanced, organic liquid or granular fertilizer.

Pruning or Maintenance

Astilbes are rather slow to establish but spread quickly once their roots settle and form broad clumps of plants with crowns that rise about the soil over time. To keep astilbes healthy, re-cover the crowns as needed with fresh soil or compost and divide the plants every 3 to 4 years in spring. These plants don’t need much pruning and won’t reflower with deadheading, but you can freshen their look by clipping off spent flowers when they begin to fade.

Seasonal Care

Hardy to Zone 3, astilbes don’t need much winter management, but their leaves may turn yellow at the first frost. If desired, you can clip the leaves away when they do, or leave them as-is. Plants in the garden will benefit from a light layer of mulch applied in fall, while container-grown plants may need their pots to be buried in the garden or protected with frost blankets to ensure the containers don’t break.

Harvesting

When to Harvest

Astilbes look beautiful in cut fllower arrangements and blooms can be harvested as soon as they unfurl in all their beauty!

How to Harvest

To harvest astilbe blooms or leaves, simply clip them off with sharp, sterilized pruners or scissors. Just avoid harvesting more than 1/3 of your plant’s stems or flowers at once to prevent stress.

Storage

Astilbe flowers typically last in a vase for about 4 to 12 days, but they also dry beautifully.

Pests and Problems

As perennials go, astilbe are tough as nails plants that tend to naturally resist deer and rabbit damage. But even these sturdy flowers can suffer from a few common issues.

Common Problems

  • Yellow leaves may occur if astilbes receive too much sun, or if they’re over- or underwatered. If the leaves yellow towards the top of the plant, sun-scorch is most likely. Consistent yellowing usually indicates a watering issue, which you can confirm by feeling the soil.
  • Reduced flowering may result if astilbes are underfertilized or overcrowded. To avoid this fate, fertilize astilbes regularly and divide plants every 3 to 4 years.
  • Wilting usually indicates that astilbes need more water, but plants may wilt in overly wet conditions if their roots begin to rot due to excess moisture.

Common Pests

  • Asiatic garden beetles are small, 1/3-inch long brownish beetles that may chew holes in astilbe leaves. These pests can be dislodged with your garden hose or managed with companion planting and organic insecticidal soap sprays.
  • Weevils sometimes nibble on astilbe roots, which can lead to wilting and plant death. Beneficial nematodes can be used to treat these pests, but you can also avoid reoccurrences by growing astilbes in containers with fresh soil.
  • Nematodes aren’t always the “good guys” and some destructive nematodes can cause leaf discoloration in astilbes. Severe cases are usually not fixable and it’s best to destroy affected plants.

Plant diseases

  • Powdery mildew can set in if astilbes are grown in areas with poor air flow and watered from the top down. The best way to prevent this issue is to space astilbes out properly, ensure they get enough sun, and water plants at the soil line.
  • Other diseases, like fusarium wilt and leaf spot can affect astilbes too. These issues can sometimes be prevented or reversed by destroying infected plant material in fall and adding mulch to reduce soil splashing, but severe cases may require plants to be destroyed.

Types

Popular astilbe hybrids include …

  • ‘Fanal’ boasts dark green foliage, dark crimson flowers, and grows to about 1½ feet tall.
  • ‘Irrlicht’ enchants with dark green foliage, elegant white flowers, and a maximum height of up to 2 feet tall.
  • ‘Visions’ is a particularly drought-tolerant option with strong stems, green leaves, and thick raspberry-hued flowers.

Wit and Wisdom

  • Astilbe plants were first popularized in Japan in the 1800s.
  • The first cultivated astilbes were developed to produce forced blooms in winter and were intended to be grown indoors.
  • According to the language of flowers, astilbes symbolize patience, devotion, and the message: “I will wait for you.”

Flowers
Shade Gardening

About The Author

Catherine Boeckmann

Catherine Boeckmann

Executive Digital Editor and Master Gardener

Catherine Boeckmann loves nature, stargazing, and gardening, so it’s not surprising that she and The Old Farmer’s Almanac found each other. She leads digital content for the Almanac website and is also a certified master gardener in the state of Indiana.

Read more from Catherine Boeckmann

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Comments

<span>Ejbradt</span> Thu, 05/25/2017 - 18:58
I have had a row of astilbe growing on the east side of my house for a decade, between my sidewalk and the foundation. It is in a sandy soil. I thought I lost them last summer during an extremely hot summer drought in SW Ontario, Canada, they died right back, I only had one with any leaves on it. Surprisingly, they came back this spring as if nothing happened. I don't think these flowers are difficult to grow at all if they are in the right place.
<span>Vicky</span> Thu, 05/18/2017 - 12:40
I planted 12-18 (can't remember - bought in bags at Costco) Astilbes 3 varieties in early April. A couple did not come up, however the rest did and some are already in bloom. I would say they are Very easy to grow- filtered morning and afternoon sun. No special watering needs, but may require some extra watering this summer. Good Luck!
<span>Jonel</span> Wed, 05/17/2017 - 18:19
I planted 3 roots of the red sentinel and 2 of the purple sonny boys in may they are in mostly shade. When should I see any growth in the ground from them coming up.im watering them like I should.how long shall I see some growth
<span>Cathy</span> Mon, 05/15/2017 - 08:20
I gave my daughter in law 6 Astilbe bulbs which she planted mid April and has been watering every few days for a month now but no sign of anything yet. We live in Central Illinois and her flower bed is on the west side of the house in moderate shade/sun...any help would be great!
<span>Rosanne</span> Mon, 04/03/2017 - 06:00
Hello, We live in Southeast Michigan, and I recently purchased 4 Astilbe plants. While we have mild temperatures this week, it is highly likely that we will have a few/many frosts in April and May. Would you know when it would be 'safe' to plant them? Thank you!
<span>Donna</span> Wed, 05/17/2017 - 14:29
I'm a huge fan of plant food to get plants started and don't forget your soil might not be the best. Start with a deep hole about 8" add potting soil and manure. Feed plants once a month.
<a title="View user profile." href="/author/editors">The Editors</a> Thu, 04/06/2017 - 11:18

Hi Rosanne, excellent question!

You should plant new Astilbe plants after all danger of frost has passed. For a young plant establishing its root system, the frost would most likely damage and stunt its growth. We would recommend waiting until a mid to late May to plant, but you can also find the last frost date for your region by entering in your zip code here: http://www.almanac.com/gardening/frostdates/   

As you might be able to tell from other questions and responses to this post, Astilbe is a needy plant requiring a middle ground of everything. It needs plenty of water, but not too much; partial sun, but too much and it could burn; and balanced soil with pH between 6.0 and 8.0. Just read and try to follow the guidance from the article above the best you can. Good luck and happy gardening!  

 <span>J</span> Fri, 03/31/2017 - 11:09
I had new astilbes planted last July; they looked pretty feeble from the get-go, and almost died but after some careful watering and pruning, they revived and at least were small green leafy plants. After the first freeze, they totally went brown and all the leaves fell off, and they just look like crumpled dead brown stems now. Are they dead for good or as of April should they be showing at least some signs of regrowth? They look dead to me.
<span>Jacqueline Lee</span> Fri, 03/10/2017 - 15:52
Should my astilbe's look dead at this time of year ?
<a title="View user profile." href="/author/editors">The Editors</a> Mon, 03/13/2017 - 14:36

Astilbes will go dormant (and look dead) when not in season, but in the spring they should start to revive and leaf out once ideal conditions (including plenty of water) return.