| SUN | SOIL MOISTURE | HEIGHT |
|---|---|---|
|
|
|
5' |
| BLOOM | USDA ZONES | BLOOM COLOR |
|---|---|---|
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Swamp Aster is a tall, late-blooming native perennial that brightens wet meadows, streambanks, and rain-garden plantings with masses of soft lavender to pale blue flowers. Its branching stems are covered in daisy-like blooms from late summer into fall, providing a cloud of color when many other plants are fading. The foliage is slender and often slightly arching, giving the plant a graceful, naturalized look in moist landscapes. Durable, adaptable, and highly attractive to pollinators, Swamp Aster is an excellent choice for adding late-season interest to wetter garden areas.
Overall height at 3–5 feet.
Swamp Aster serves as a host plant for several native butterfly and moth larvae, including species of crescents, checkerspots, and various generalist moth caterpillars that feed on aster foliage. Its abundant late-season blooms also support native bees, skippers, and migrating butterflies, making it a key nectar source in autumn.
Historical accounts note that asters, including wetland species like Swamp 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.
Swamp Aster provides critical late-season nectar for pollinators, helping sustain bees and butterflies during a period of natural scarcity. 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 plays an important role in supporting wetland and riparian biodiversity.
| 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) |
Swamp Aster grows best in full sun to light shade and prefers medium to wet soils, thriving in loamy, silty, or clay-loam sites that retain consistent moisture. It naturally occurs in wetlands, ditches, floodplains, and moist prairies, making it well suited for rain gardens and low-lying areas. Once established, it tolerates seasonal flooding and requires little maintenance beyond occasional thinning if clumps become too large.
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.
