Photo: Franz XaverCC BY-SA 3.0via Wikimedia Commonsresized / cropped
Bigleaf aster Plant Care
Eurybia conspicua (Lindl.) G.L.Nesom
Updated · Sources · How we source care data
Eurybia conspicua, commonly known as the western showy aster, is a North American species of plants in the family Asteraceae. It is native to western Canada (from Manitoba to British Columbia) and the western United States (northern Cascades, northern Rockies, Black Hills, and other mountains of Washington, Oregon, Idaho, Montana, Wyoming, and South Dakota).
Every 7–10 days
Full sun to partial shade
50–75°F
40–70%
At a glance
How do you care for Bigleaf aster?
Water Bigleaf 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 Bigleaf aster Native To?
What Is the Bigleaf aster?
Bigleaf aster (Eurybia conspicua) belongs to the Asteraceae family within the Eurybia genus. Bigleaf aster is native to western Canada and the western United States. Bigleaf aster is also known as Showy aster, Aster conspicuus.
Bigleaf aster displays a clumping perennial growth habit, reaching up to 1.5 ft tall with a spread of approximately 1.5 ft. Bigleaf aster produces daisy-like flowers in various colors.
Leaf size: approximately 4 inches.
How Often Should You Water a Bigleaf aster?
Eurybia conspicua 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 Bigleaf aster Need?
Bigleaf aster thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Bigleaf aster Prefer?
Eurybia conspicua grows best at temperatures of 50–75°F. Bigleaf aster prefers humidity levels of 40–70%.
Temperature
50–75°F
Humidity
40–70%
What Soil Mix Works Best for a Bigleaf aster?
Well-draining sandy loam with added organic matter. Good drainage is essential for Bigleaf aster to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Bigleaf aster?
Feed Bigleaf 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 Bigleaf aster?
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 Bigleaf aster?
Bigleaf aster can be propagated through division, seeds. Similar propagation techniques also apply to compact aster plant care, which shares the same genus.
Is the Bigleaf aster Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Bigleaf 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 Bigleaf aster?
Bigleaf aster is susceptible to aphids, spider mites, powdery mildew. 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 Bigleaf aster Need?
Bigleaf aster grows outdoors in USDA Zone 12a. It survives winters down to planting zone 12a. Bigleaf aster is native to western Canada and the western United States. In cooler regions, grow Bigleaf aster as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 12a
Keep exploring plants
Bigleaf 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 Eurybia genus — compare its care with other Eurybia species on PlantoScan.
Eurybia is part of the Asteraceae plant family — browse all Asteraceae genera and species.
Bigleaf aster thrives in bright light and direct sun — see other bright-light plants.
More Eurybia Species
Other Eurybia species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Eurybia conspicua (Lindl.) G.L.Nesom, family Asteraceae (first published in Phytologia 77(3): 259 (1995)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Bigleaf 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: Franz Xaver, CC BY-SA 3.0, Wikimedia Commons — original.
- Hardiness zone: USDA Zone 12a, calculated from the plant's minimum temperature.
- 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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