Photo: The CosmonautCC BY-SA 2.5 cavia Wikimedia Commonsresized / cropped
Tall Aster Plant Care
Aster altissimus Mill.
Updated · Sources · How we source care data
Native to the mountains of the southeastern United States, this plant is known for its striking large, lance-shaped leaves with serrated edges. Plant collectors are drawn to Aster altissimus for its impressive height, vibrant purple flowers, and ability to attract pollinators to the garden.
Every 7–10 days
Full sun to partial shade
50–75°F
40–70%
At a glance
How do you care for Tall Aster?
Water Tall Aster every 7–10 days, letting the top layer of soil dry out between waterings, and give it full sun to partial shade. It prefers temperatures of 50–75°F (10–24°C) and 40–70% humidity. Fertilize it every 6 months during the growing season.
Where Is the Tall Aster Native To?
What Is the Tall Aster?
Tall Aster (Aster altissimus) belongs to the Asteraceae family within the Aster genus. Tall Aster is native to central and eastern North America. Tall Aster is also known as Tall White Prairie Aster, Aster altissimus, Aster amplexicaulis.
Tall Aster displays an upright, bushy perennial growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Tall Aster produces daisy-like flowers in various colors like purple, pink, white, and blue.
Leaf size: approximately 4 inches.
How Often Should You Water a Tall Aster?
Aster altissimus requires watering every 7–10 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.
Watering Frequency
Every 7–10 days
Let soil partially dry between waterings
What Light Does the Tall Aster Need?
Tall Aster thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Tall Aster Prefer?
Aster altissimus grows best at temperatures of 50–75°F. Tall Aster prefers humidity levels of 40–70%.
Temperature
50–75°F
Humidity
40–70%
What Soil Mix Works Best for a Tall Aster?
Well-draining loamy soil with added compost for nutrients. Good drainage is essential for Tall Aster to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Tall Aster?
Feed Tall Aster every 6 months during the growing season (spring and summer) with a balanced fertilizer diluted to the strength on the label.
Pause feeding in autumn and winter, when growth slows, and never fertilize dry soil — water first.
Fertilizing
Every 6 months
During the growing season
The PlantoScan app can remind you when to water and when to fertilize each plant.
How Do You Repot a Tall Aster?
Divide and repot every 2-3 years in early spring. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.
How Do You Propagate a Tall Aster?
Tall Aster can be propagated through seeds, division of clumps. Similar propagation techniques also apply to rough-surface aster plant care, which shares the same genus.
Is the Tall Aster Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Tall Aster, so we can't confirm whether it is safe for cats and dogs. Keep pets from chewing it as a precaution.
This is a general caution, not veterinary or medical advice. If your pet ate a plant, contact your vet or animal poison control.
See all plants toxic to cats and plants toxic to dogs.
What Pests and Diseases Affect the Tall Aster?
Tall Aster is susceptible to aphids, slugs, snails. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.
Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.
What USDA Hardiness Zone Does the Tall Aster Need?
Tall Aster grows outdoors in USDA Zone 3a – 8b. It survives winters down to planting zone 3a. Tall Aster is native to central and eastern North America.
Hardiness Zone
Zone 3a – 8b
Keep exploring plants
Tall Aster is one of many species covered in the complete plant care and identification guide, which groups plants by genus, attribute, and popularity.
It belongs to the Aster genus — compare its care with other Aster species on PlantoScan.
Aster is part of the Asteraceae plant family — browse all Asteraceae genera and species.
Tall Aster thrives in bright light and direct sun — see other bright-light plants.
More Aster Species
Other Aster species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Aster altissimus Mill., family Asteraceae (first published in Gard. Dict., ed. 8. n. 20. 1768 [16 Apr 1768]) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Tall Aster, so we can't confirm whether it is safe for cats and dogs. Checked against the ASPCA plant list; any other toxicity note on this page comes from PlantoScan's plant database.
- Photo: The Cosmonaut, CC BY-SA 2.5 ca, Wikimedia Commons — original.
- Hardiness zone: USDA Zone 3a – 8b, estimated from the plant's typical growing conditions.
- Care values(watering, light, temperature, humidity, soil, fertilizing): PlantoScan's plant database, filtered by automatic plausibility checks — values that fail them are hidden. How we source and check plant data.
Spotted a mistake? Email info@upvision.media with the page link — we check and correct reported errors.
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