When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works.
Astilbe, which is also called false spirea, is a popular perennial plant with beautiful flowers that look like plumes and leaves that look like ferns. It grows in shady areas and, in the wild, is found near creeks and ponds. It is usually propagated by root division in spring. Sometimes it is sold bare root at that time. Read on for more information about growing astilbe from bare roots.
If you go out to buy astilbe in early spring, you may find nurseries selling it bare root. This means it doesn’t have a root ball and the soil it was growing in has been washed off of it. It is ready for astilbe bare root planting. A bare root plant may be sold with its roots wrapped in moist peat moss or shredded newspaper. Remember that bare root plants are less likely to get damaged during shipping if you want to grow astilbe from bare roots. Astilbe bare root plants won’t have any leaves or flowers that can be knocked off in transport. Still, bare root planting of astilbe calls for some extra care from a gardener.
Astilbe, also known as false spirea, is a gorgeous flowering perennial perfect for shady gardens. Its feathery plume blooms and fern-like foliage add beautiful texture and soft colors to the landscape. Astilbe is most commonly sold as container grown or potted plants. However, you can also purchase astilbe as dormant bare root crowns in early spring. Planting astilbe from bare roots can be an affordable way to add multiple plants while avoiding a heavy pot. Follow this complete step-by-step guide to successfully plant your new astilbe bare roots for abundant blooms.
Overview of Astilbe Bare Roots
Bare root plants are dormant, meaning no active foliage growth is occurring when they are dug up and packaged for sale. The soil is removed from the roots before shipping. This reduces transplant shock and allows the roots to be thoroughly inspected for health before purchasing.
Astilbe bare root crowns consist of the shortened stem base and attached root mass with no leaves present. Small, rounded growth buds called eyes are visible at the top of the crown where new shoots will emerge. The roots will be bare with no soil or packaging material.
Bare roots require proper care to prevent drying out before planting. But with the right techniques, bare root astilbe can become established quickly, taking advantage of the full growing season.
When to Plant Bare Root Astilbe
For best results, astilbe bare roots should be planted in early spring while still dormant. The ideal window is usually late March through April Planting during this period allows root growth to become established before active foliage emerges
Avoid planting bare roots in summer when hot, dry conditions may stress root development. Well-hydrated soil and cool temperatures are key to the bare rooting process. Prepare planting beds ahead of time so bare roots can go straight from packaging to soil contact.
How to Plant Astilbe Bare Roots
Follow these simple steps for successfully planting bare root astilbe in your garden:
Step 1: Prepare Soil
-
Select a planting area with rich, moisture-retentive soil and partial to full shade exposure.
-
Work compost or well-rotted manure into the top 6 inches of soil to enrich and improve drainage
Step 2: Dig Planting Holes
-
Dig a hole 12-18 inches wide x 6-8 inches deep for each bare root crown
-
Space holes 12-24 inches apart depending on mature astilbe size.
Step 3: Hydrate Roots
-
Remove bare root from packaging and place in a bucket of water for 30-60 minutes before planting.
-
Keep bare roots moist if unable to plant right away. Never allow roots to dry out.
Step 4: Prune Roots and Crown
-
Use bypass pruners to trim any broken or damaged roots back to healthy tissue.
-
Remove 1-2 inches from the top of the root crown if appearing dry or split.
Step 5: Set Crown in Hole
-
Spread roots evenly around hole with crown centered at soil level.
-
Top of root crown with growth buds should be level with ground.
Step 6: Backfill Soil
-
Hold crown in place and backfill hole with native soil, gently firming around roots.
-
Leave no air pockets around roots or below crown.
Step 7: Water Thoroughly
-
Water freshly planted astilbe generously to settle soil and eliminate air gaps.
-
Check soil moisture levels regularly and water as needed while roots establish.
Astilbe Bare Root Planting Tips
-
Stagger bare roots in hole rather than lining up roots vertically for best coverage.
-
Top dress planted astilbe with 2-3 inches of mulch to retain moisture while establishing.
-
Apply liquid organic fertilizer once foliage is actively growing to support root development.
-
Shelter newly planted astilbe from hot sun and wind exposure which can dry roots out.
-
Avoid disturbing bare root plantings until well anchored – about 8 weeks after planting.
Ongoing Care of Planted Bare Root Astilbe
Caring for your astilbe properly after bare root planting encourages healthy establishment:
-
Water whenever the top few inches of soil become dry. Provide 1-2 inches of water per week.
-
Weed carefully around new plants, avoiding damage to shallow roots.
-
Prune spent flower plumes back to the base after blooming concludes.
-
Top dress annually with fresh compost or slow-release organic fertilizer.
-
Divide congested clumps every 3-5 years in early spring.
With attentive watering, pruning and soil enrichment, your bare root astilbe will grow vigorously and produce bountiful blooms year after year.
Troubleshooting Problems After Planting Bare Root Astilbe
Issues that may arise after planting bare root astilbe include:
-
Leaves emerging then dying: Roots unable to establish due to dry soil, inadequate watering, or planted too deep.
-
Few or no leaves emerging: Damaged or desiccated root system unable to support growth. Discard plant and start over.
-
Foliage yellowing: Nutrient deficiency from poor soil preparation or lack of fertilization. Amend soil and apply all-purpose fertilizer according to package instructions.
-
No flowers: Insufficient sunlight, pruning at wrong time, or inadequate moisture for bud formation. Assess growing conditions and adjust as needed.
-
Whole plant dies: Root rot from overwatering or crown planted too deep. Allow soil to dry and replant new bare root crowns.
Long-Term Care of Astilbe From Bare Roots
To maximize growth and blooms from your bare root astilbe for years to come:
-
Divide root clumps when they become overcrowded, usually every 3-5 years. Replant divisions or give away.
-
Prune spent flower plumes back to the foliage after blooming finishes.
-
Mulch annually with 2-3 inches of organic matter like shredded leaves or pine straw.
-
Water during drought, providing 1-2 inches per week from spring through fall.
-
Fertilize in early spring with a balanced 10-10-10 or compost to support growth.
With proper siting, planting, and care your astilbe bare root crowns will thrive and enhance your garden with wispy, colorful blooms for many seasons.
Frequently Asked Questions About Bare Root Astilbe
When is the best time to plant bare root astilbe?
For optimal establishment, plant astilbe bare roots in early spring while plants are still dormant.
How long can bare root astilbe be kept before planting?
Bare roots should be planted as soon as possible but can be held for 2-3 weeks if kept moist and cool.
How far apart should astilbe bare roots be spaced when planting?
Space astilbe bare root crowns 12-24 inches apart depending on the mature size of the variety planted.
Should astilbe bare roots be soaked before planting?
Yes, soaking bare root crowns for 30-60 minutes before planting will rehydrate tissues and help prevent transplant shock.
What soil conditions does bare root astilbe prefer?
Astilbe thrives in moist, humus-rich soil high in organic matter. Adding compost when planting improves drainage and nutrients.
Final Thoughts on Planting Astilbe Bare Roots
Astilbe is a gorgeous perennial suited to shady garden beds and borders. Purchasing and planting bare root crowns in early spring is an affordable way to establish a stand of these striking bloomers quickly and effectively. Follow best practices for planting depth, soil preparation, spacing, and hydration to give your new bare root astilbe the best start possible. With proper follow-up care, your astilbe will flourish, creating a beautiful foliage and flower display for years to come.
Astilbe Bare Root Planting
Remember that when you grow astilbe from bare roots, you should always keep the roots moist. You should never allow them to dry out. This is why the roots of the plants are shipped packed in wet stuff: they dry out quickly. They should be opened as soon as they arrive if you have them shipped. Make sure the roots are still wet. If not, add a little water.
Bare Root Planting of Astilbe
Bare root planting of astilbe is fairly easy, as long as you remember to keep the roots damp. When you first get the plants, inspect the roots and clip out any that are broken or damaged. The next step is to dig large planting holes. You want enough space for the roots to spread out fully, so you don’t have to cram them into the sides. Spread out the roots in the hole. The hole should be deep enough for them, but the top of the root should only be just above the soil. Fill in the hole with the dirt you removed, pressing it into place. Give the plant a generous drink, and water the soil regularly until the astilbe is established.