Wood's Blue Aster
Wood's Blue Aster
A Compact, Mildew-Resistant Native Aster in Blue
Wood's Blue Aster (Symphyotrichum dumosum 'Wood's Blue') rounds out the Wood's series with cool blue-violet, yellow-centered daisies on a tidy, low mound in late summer and fall. Bred for excellent mildew resistance, it keeps clean foliage while offering crucial late-season nectar for monarchs and native bees. Its true-blue tones are a refreshing fall note, and it's a dependable, easy choice for Eden Prairie, Plymouth, and Eagan pollinator gardens.
| Attribute | Detail |
|---|---|
| Botanical Name | Symphyotrichum dumosum 'Wood's Blue' |
| Mature Size | 12–18 in tall and wide (compact) |
| Hardiness Zone | Zone 4–8 (hardy across most of Minnesota) |
| Light | Full sun to part shade |
| Bloom Time | Late summer to fall |
| Flower Color | Blue-violet with yellow centers |
| Soil | Average, well-drained; tolerates clay |
Landscape Uses
Use Wood's Blue at the front of borders, in pollinator and native gardens, and in containers. Its mildew resistance and tidy habit pair beautifully with ornamental grasses, sedum, goldenrod, and other asters.
Best Time to Plant
Plant in spring or early fall. Spring planting gives the longest establishment window before winter.
How to Plant
Dig a hole twice as wide as the root ball and just as deep. Set the crown level with the soil, backfill, water in well, and mulch 2–3 inches deep, keeping mulch off the stems.
Watering
First Year: Water deeply 1–2 times per week to establish the roots.
After Year One: Water during dry spells. Asters are fairly drought tolerant once established but bloom best with occasional water.
Drip Irrigation: A drip line keeps moisture even without wetting foliage, which helps prevent mildew.
Frequently Asked Questions
Is Wood's Blue mildew resistant?
Yes, the Wood's series is known for clean, mildew-resistant foliage.
Is it good for pollinators?
Yes, asters are among the most important fall nectar sources for monarchs and native bees.
Is it hardy in Minnesota?
Yes, hardy to Zone 4 and reliable statewide.
Is it deer resistant?
Yes, deer tend to avoid asters.
You May Also Like
Pair Wood's Blue with Wood's Pink and Wood's Purple, ornamental grasses, and fall perennials for a pollinator-friendly autumn display.
How Many Wood's Blue Aster Do I Need?
Wood's Blue Aster stays a compact 12–18 in mound, so space plants about 16 inches apart for a solid front-of-border edge. For accents, plant in groups of 3–5.
| Bed / Run Length | Plants Needed (at ~16 in apart) |
|---|---|
| 5 ft | 4 plants |
| 10 ft | 8 plants |
| 15 ft | 11 plants |
| 20 ft | 15 plants |
Wood's Blue Aster Season-by-Season in Minnesota
- Spring: A tidy, mildew-resistant green mound fills in.
- Summer: Foliage stays clean and compact, building toward bloom.
- Fall: Cool blue-violet, yellow-centered daisies smother the mound late summer into fall — vital nectar for migrating monarchs and native bees.
- Winter: Cut back after frost; the crown overwinters dormant and returns each spring.
At a Glance
✔ Pollinator-Friendly ✔ Deer-Resistant ✔ Drought-Tolerant ✔ Shade-Tolerant
Plant It With
- Wood's Pink Aster — a Wood's-series sibling for a multi-color sweep of mildew-resistant asters.
- Wood's Purple Aster — another Wood's aster to mass the late-season pollinator show.
- Autumn Fire Sedum — rosy fall flower heads that bloom right alongside the asters.
- Little Bluestem — a native grass for prairie-style texture and fall color.
Is Wood's Blue Aster Right for Your Yard?
This Wood's-series aster is an easy front-of-border pollinator plant for full sun to part shade in average, well-drained Minnesota soil, and its bred-in mildew resistance keeps the foliage clean all season. It's not a fit for deep shade or constantly wet ground.