SEED ORDERS OVER $100 SHIP FREE!
Symphyotrichum oolentangiense

Sky Blue Aster

$3.00 - $600.00

Packet
$3.00
1/8 oz.
$10.00
1/4 oz.
$15.00
1/2 oz.
$25.00
1 oz.
$40.00
1 lb.
$600.00

Bare Root Plants
Out of Stock

3 Pack
Out of Stock

Sky Blue Aster has blue to blue-violet flowers. It is easy to grow and is drought tolerant. Blooming late summer to fall, like most Asters, it attracts butterflies and other beneficial insects such as small bees, flies, small to medium-sized butterflies, skippers, and wasps.

Sky Blue Aster prefers full or partial sun and can grow in many different types of soil as long as it is well-drained. The leaves are smaller when heading upward along the stem, and are typically heart-shaped at the base. The leaves on the very similar-looking Smooth Blue Aster are indeed smooth to the touch. Sky Blue Aster has rough leaves, as do many other Asters. It is also scientifically named Aster oolentangiensis and Aster azureus.

Live Plant Shipping Table

Spring Fall Age/Size
Dormant Bare Roots
April/May October 1 year
Potted 3-Packs May/June N/A 2.5" wide x 3.5" deep pots

Symphyotrichum oolentangiense - Sky Blue Aster

Map Key

Present in state
Present but introduced in county
Present and native in county; not rare
Not present in state
Present and native in county; rare
Species extirpated (historic)
State or county listed as noxious
Present in state; exotic

This map shows the native and introduced (adventive) range of this species. Given appropriate habitat and climate, native plants can be grown outside their range.

3 Questions asked on Symphyotrichum oolentangiense

Hello, could you tell me how aggressively this aster spreads? Thank you!
Asters in general will dump a lot of seeds when they are healthy, so the potential is always there for many seedlings. The seeds are wind dispersed so they may or may not settle in the area around the mother plants. Many factors contribute to the number of successful seedlings, such as how open the area is for new seeds to colonize.

Most of the time this Sky Blue Aster will not spread aggressively but if there is an open area and adequate moisture/light the potential for many volunteer plants is there.

Sky Blue does not spread by rhizomes AND seed as some of the really aggressive Asters do and for this reason you will see it included in Rain Gardens and Flower beds.

We have not had problems in the Prairie Moon Rain Garden where it has been planted and mulched for close to 10 years.
Germination code says these seeds do best when planted in cool soil. Can we plant them early June and just expect much less success or will they not germinate at all in warmer (Chicagoland) soil? We're hoping to fill a small 1'x3' swath. But we'll be patient if you insist ;)
Hi Jen. Surprisingly Sky Blue Aster can be finicky and hard to germinate. I would suggest holding on to the seed planting in the fall. While it doesn't need stratification (code A), it does like cool soil and at this point soil temps are getting too warm.
I have several sky blue aster plants in my native garden. They have reached maturity and are beginning to form buds. Some of the stems have broken at the base of the plant. Is this normal? If not, what do I need to do to correct it? The plants also needs staking because the stems fall over. Is this normal? I have the same problem with some of my Black Eyed Susan’s.
Hi Debbie. Sky Blue Aster can have dainty stems and are prone to listing over, especially if they are not close to neighboring plants to help support them. The Black Eyed Susans can show those tendencies to some extent as well, but it may be that the soil in your garden is a little too rich. Excessive nutrients can promote lazy, lanky stem growth.

Seed

Growing your own plants from seed is the most economical way to add natives to your home. Before you get started, one of the most important things to know about the seeds of wild plants is that many have built-in dormancy mechanisms that prevent the seed from germinating. In nature, this prevents a population of plants from germinating all at once, before killing frosts, or in times of drought. To propagate native plants, a gardener must break this dormancy before seed will grow.

Each species is different, so be sure to check the GERMINATION CODE listed on the website, in the catalog, or on your seed packet. Then, follow the GERMINATION INSTRUCTIONS prior to planting. Some species don't need any pre-treatment to germinate, but some species have dormancy mechanisms that must be broken before the seed will germinate. Some dormancy can be broken in a few minutes, but some species take months or even years.

Seed dormancy can be broken artificially by prolonged refrigeration of damp seed in the process of cold/moist STRATIFICATION. A less complicated approach is to let nature handle the stratifying through a dormant seeding, sowing seeds on the surface of a weed-free site in late fall or winter. Tucked safely beneath the snow, seeds will be conditioned by weathering to make germination possible in subsequent growing seasons.

To learn more, read our BLOG: How to Germinate Native Seeds

Dormant Bare Root Plants

We dig plants when they are dormant from our outdoor beds and ship them April-May and October. Some species go dormant in the summer and we can ship them July/August. We are among the few still employing this production method, which is labor intensive but plant-friendly. They arrive to you dormant, with little to no top-growth (bare-root), packed in peat moss. They should be planted as soon as possible. Unlike greenhouse-grown plants, bare-root plants can be planted during cold weather or anytime the soil is not frozen. A root photo is included with each species to illustrate the optimal depth and orientation. Planting instructions/care are also included with each order.

Download: Installing Your Bare-Root Plants

Potted Plants

3-packs and trays of 32, 38, or 50 plants leave our Midwest greenhouses based on species readiness (being well-rooted for transit) and order date; Spring shipping is typically early May through June, and Fall shipping is mid-August through September. Potted 3-packs and trays of 38 plugs are started from seed in the winter so are typically 3-4 months old when they ship. Trays of 32/50 plugs are usually overwintered so are 1 year old. Plant tray cells are approximately 2” wide x 5” deep in the trays of 38 and 50, and 2.5" wide x 3.5" deep in the 3-packs and trays of 32; ideal for deep-rooted natives. Full-color tags and planting & care instructions are included with each order.

Download: Planting and Care of Potted Plants

*PLEASE NOTE: we are a mail order nursery and have no retail facilities, but you may pick up your order if prior arrangements are made. Pick up orders are subject to **MN Sales Tax.

Shipping & Handling Charges

SEED $100.00 and under: $5.00
Retail SEED orders over $100.00 ship free!

Custom seed mixes or discounted seed sales over $100, add 5% of the total seed cost
(for orders over $1,000 a package signature may be required)

BARE ROOT and POTTED PLANTS $50.00 and under: $9.00
over $50.00: 18% of the total plant cost. (For orders over $1,000 a package signature may be required.)

TOOLS and BOOKS have the shipping fee included in the cost of the product (within the contiguous US).

**We are required to collect state sales tax in certain states. Your state's eligibility and % will be calculated at checkout. MN State Sales Tax of 7.375% is applied for orders picked up at our MN location. Shipping & handling charges are also subject to the sales tax.

Shipping Season

SEED, TOOLS and BOOKS are sent year-round. Most orders ship within 1-3 business days.

BARE ROOT PLANTS are shipped during optimal transplanting time: Spring (April-May) and Fall (Oct). Some ephemeral species are also available for summer shipping. Since our plants are field-grown, Nature sets the schedule each year as to when our season will begin and end. We fill all orders, on a first-come, first-serve basis, to the best of our ability depending on weather conditions beyond our control.

POTTED PLANTS (Trays of 32/38/50 plugs and 3-packs) typically begin shipping early May and go into June; shipping time is heavily dependent on all the species in your order being well-rooted. If winter-spring greenhouse growing conditions are favorable and all species are well-rooted at once, then we ship by order date (first come, first serve). We are a Midwest greenhouse, and due to the challenges of getting all the species in the Mix & Match and Pre-Designed Garden Kits transit-ready at the same time, we typically can't ship before early May. Earlier shipment requests will be considered on a case-by-case basis.

*We are unable to ship PLANTS (bare root or potted) outside the contiguous US or to CALIFORNIA due to regulations.

Delivery

We ship using USPS, UPS and Spee Dee. UPS and Spee Dee are often used for expediting plant orders; they will not deliver to Post Office Box numbers, so please also include your street address if ordering plants. We send tracking numbers to your email address so please include it when you order.

FOR MORE DETAILED SHIPPING INFORMATION, INCLUDING CANADA SHIPPING RATES (SEED ONLY), PLEASE SEE 'SHIPPING' AT THE FOOTER OF THIS WEBSITE.

Details

Seeds/Packet
500
Seeds/Ounce
70,000
Germination Code
A
G
Life Cycle
Perennial
Sun Exposure
Full, Partial
Soil Moisture
Medium, Medium-Dry, Dry
Height
3 feet
Bloom Time
August, September, October
Bloom Color
Blue
Advantages
Pollinator Favorite: butterflies, moths, bees, wasps, beetles
Bird Favorite: seeds, insects, fruit, nectar, nesting, perch
Highly recommended for home landscaping
USDA Zones
3-8
Plant Spacing
1-2'
Catalog Code
AST02F