| SUN | SOIL MOISTURE | HEIGHT |
|---|---|---|
|
|
|
4' |
| BLOOM | USDA ZONES | BLOOM COLOR |
|---|---|---|
|
|
|
Smooth Blue Aster is a sturdy, upright native perennial that produces abundant clusters of soft blue to violet flowers with bright yellow centers that deepen to warm tones as they age. Its smooth, bluish stems and clean, lance-shaped foliage give it a refined appearance in prairies, meadows, and garden borders. Blooming from late summer into fall, it adds reliable color when many other plants are finishing for the season. Long-lived, adaptable, and highly attractive to pollinators, Smooth Blue Aster is a dependable choice for native plantings and restoration work.
Overall height at 2–4 feet.
Smooth Blue Aster serves as a host plant for several native butterfly and moth larvae, including the Pearl Crescent Phyciodes tharos, which relies heavily on asters for its caterpillars. Additional generalist moth species also feed on aster foliage, and its late-season blooms support native bees, skippers, and migrating butterflies.
Historical accounts note that asters, including species similar to Smooth Blue Aster, were used by Indigenous peoples in traditional teas, poultices, and smudges for calming or respiratory purposes. These uses reflect cultural tradition rather than modern medical practice and should be understood as historical context rather than clinical guidance.
Smooth Blue Aster provides critical late-season nectar for pollinators, supporting bees, butterflies, and other beneficial insects when few other plants are blooming. Its seeds are eaten by small birds such as finches, and its stems and foliage offer shelter for overwintering insects. As a native perennial, it contributes significantly to prairie biodiversity and ecological resilience.
| Unreported | |
 | Unreported (Absent for area) |
| Native | |
 | Native in state (NA Native and Present in state, but not Present in county) |
 | Native in state and Present in county (NA Native and Present in state, and Present in county) |
 | Rare in state and Present in county (NA Native and Rare in state, and Present in county) |
 | Extirpated/Historic in state/Native (NA Native and Reported in county) |
 | Adventive or Introduced state (NA Native and Adventive in state, and Present in county) |
| Exotic Occurrences | |
 | Exotic in state (Exotic and Present in state, but not Present in county) |
 | Exotic in state and Present in county (Exotic and Present in state, and Present in county) |
| Other | |
 | Noxious in state (Noxious in state, and Present in county) |
 | Questionable Presence (cross-hatched) |
Smooth Blue Aster grows best in full sun and prefers dry to medium, well-drained soils, thriving especially in sandy, rocky, or loamy sites typical of prairies and open fields. It tolerates drought once established and remains upright even in lean soils, though richer soils may encourage taller growth. Maintenance needs are low, with optional early-summer trimming to encourage bushier plants and prevent flopping.
Please note that Riverside Native Perennials (RNP) only ships our potted “35” product via USPS. We generally can have your plants boxed up and ready to go within two or three days. All other products including our flat of plugs, 1-gallon and 3-gallon containers are only available for nursery pick up in Delaware, OH. For large orders of any of our products we can arrange shipping at an extra cost. Please contact the nursery for additional information.
It’s important to note that when we send plants to you, presentation is everything! We recognize that you’re expecting healthy plants to arrive safely on your doorstep ready to be planted and that is what we’re selling. Further, we want you to know that while we are a fully licensed and inspected perennial nursery in the state of Ohio…we are in Ohio! That means we are subject to Ohio weather. The average frost-free date for our area is May 15. So even though you may live in Florida or California your plants are growing under Ohio conditions and we do not heat our greenhouses due to the expense. Our plants may be slightly delayed but again it’s because we’re in a Zone 5 area. Because we ship nationwide, we ship plants at all times of the year. If it’s winter in Ohio, you’ll be getting dormant plants. If it’s spring or summer in Ohio, you’ll be getting plants of various sizes that are actively growing. Plants shipped during fall in Ohio may be dormant or may be heading towards dormancy. This is all natural and we do not try to modify or prolong the growing season other than to grow them in an unheated greenhouse. Even in an unheated greenhouse our plants are much further along and growing well early in the spring than if they were planted outside in Zone 5.  If you would like additional information about sizes for a particular species, please contact us via email.
In 2021 RNP partnered with a shipping professional to design and develop a shipping system that could reasonably be expected to survive the USPS mail room and transportation process. After several design sessions and going back to the drawing board on more than a couple of occasions we created a shipping box system that, to us, is bulletproof. It is strong, lightweight and, to date, has not failed in shipping nearly 150 packages of plants to all corners of the country.
Once selected from our greenhouse benches, your plants are placed into a small plastic bag to maintain moisture during shipping. To keep the soil in the pot we created a cardboard insert that perfectly fits into the top of our 35 containers. The insert has a cutout that surrounds to plant stem without damaging it. The plastic bag and insert are secured by two rubber bands. Each bagged plant is then placed into an individual corrugated cardboard box which perfectly fits the 35 container, and which locks it in place so that it will not move during transit. Four individual boxes are then placed into another, even heavier duty corrugated cardboard master shipping box. The whole effect is that of double boxing your plants. They are safe and secure for the long trip to your home landscape!
The system only works with 4 individual boxes being packed into a single master shipping box so we encourage you to buy four plants or a multiple of four plants. You can buy less than four plants but we will need to send all the cardboard for four plants in order for the shipping system to succeed as designed.
