Photo: Jan SmithCC BY 4.0via Wikimedia Commonsresized / cropped
Subspicate Aster Plant Care
Symphyotrichum subspicatum (Nees) G.L.Nesom
Updated · Sources · How we source care data
With its narrow, linear leaves and clusters of small, white flowers, this plant hails from North America. Plant collectors are drawn to Symphyotrichum subspicatum for its unique foliage and delicate blooms that add a touch of elegance to any garden.
Every 7–10 days
Full sun to partial shade
50–80°F
40–70%
At a glance
How do you care for Subspicate Aster?
Water Subspicate 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 50–80°F (10–27°C) and 40–70% humidity. Fertilize it every 6 months during the growing season.
Where Is the Subspicate Aster Native To?
What Is the Subspicate Aster?
Subspicate Aster (Symphyotrichum subspicatum) belongs to the Asteraceae family within the Symphyotrichum genus. Subspicate Aster is native to western North America. Subspicate Aster is also known as Western Aster, Douglas Aster, Aster butleri.
Subspicate Aster displays an upright, bushy perennial growth habit, reaching up to 3 ft tall with a spread of approximately 2 ft. Subspicate Aster produces daisy-like flowers in various colors like purple, blue, pink, and white.
Leaf size: approximately 4 inches.
How Often Should You Water a Subspicate Aster?
Symphyotrichum subspicatum 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 Subspicate Aster Need?
Subspicate Aster thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Subspicate Aster Prefer?
Symphyotrichum subspicatum grows best at temperatures of 50–80°F. Subspicate Aster prefers humidity levels of 40–70%.
Temperature
50–80°F
Humidity
40–70%
What Soil Mix Works Best for a Subspicate Aster?
Well-draining loamy soil with added compost for nutrients. Good drainage is essential for Subspicate Aster to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Subspicate Aster?
Feed Subspicate 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 Subspicate 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 Subspicate Aster?
Subspicate Aster can be propagated through division, stem cuttings. Similar propagation techniques also apply to pineywoods aster plant care, which shares the same genus.
Is the Subspicate Aster Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Subspicate 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 Subspicate Aster?
Subspicate 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 Subspicate Aster Need?
Subspicate Aster grows outdoors in USDA Zone 5a – 9b. It survives winters down to planting zone 5a. Subspicate Aster is native to western North America.
Hardiness Zone
Zone 5a – 9b
Keep exploring plants
Subspicate 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 Symphyotrichum genus — compare its care with other Symphyotrichum species on PlantoScan.
Symphyotrichum is part of the Asteraceae plant family — browse all Asteraceae genera and species.
Subspicate Aster thrives in bright light and direct sun — see other bright-light plants.
More Symphyotrichum Species
Other Symphyotrichum species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Symphyotrichum subspicatum (Nees) G.L.Nesom, family Asteraceae (first published in Phytologia 77(3): 293 (1995)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Subspicate 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: Jan Smith, CC BY 4.0, Wikimedia Commons — original.
- Hardiness zone: USDA Zone 5a – 9b, 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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