Starry Rosinweed (Silphium asteriscus) is a striking perennial wildflower native to the southeastern United States, featuring bright yellow, daisy-like flowers.
At-a-glance light, water, soil, and growing conditions from plant data
Full Sun
100% intensity
Requires at least 6-8 hours of direct sunlight per day for optimal flowering.
Moderate to Low
35% intensity
Prefers to dry out between waterings; drought-tolerant once established.
Well-drained
50% intensity
Moderate
50% intensity
Prefers average garden temperatures; hardy in USDA zones 4-8. Protect from extreme heat.
Low
15% intensity
Generally not needed; may benefit from a light, balanced fertilizer in spring.
Safety information from plant toxicity data
| Attribute | Value |
|---|---|
| Toxic for humans | No 0/5 intensity |
| Toxic for pets | No 0/5 intensity |
None
Key traits and growing stats from plant data
Watering, pruning, propagation, and repotting details from plant data
Water regularly during the establishment phase, but once mature, Starry Rosinweed is quite drought-tolerant. Allow the soil to dry out between waterings. Overwatering can lead to root rot, so ensure good drainage.
Reduce watering significantly in winter.
Deadhead spent flowers to encourage reblooming and maintain a tidy appearance. Cut back the foliage to the ground in late winter or early spring before new growth emerges.
Remove any dead or damaged stems as needed throughout the growing season.
Starry Rosinweed is easily propagated from seed sown in early spring or fall. It can also be propagated by division of established clumps in early spring.
Transplant seedlings or divisions carefully, as they prefer not to be disturbed.
Container-grown plants may benefit from repotting every 2-3 years, preferably in early spring before new growth begins. Choose a pot that is slightly larger than the current one and ensure it has adequate drainage holes.
Use a well-draining potting mix.
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Monthly activity intensity for bloom and fruit across both hemispheres.
Flowering & fruiting calendar
Flowering & fruiting calendar
Photos of Starry Rosinweed (Silphium asteriscus)
Where Starry Rosinweed (Silphium asteriscus) is found
Density
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Common names and botanical synonyms
Botanical classification
| Rank | Name |
|---|---|
| Kingdom | Plantae |
| Division | Tracheophyta |
| Class | Magnoliopsida |
| Order | Asterales |
| Family | Asteraceae |
| Genus | Silphium |
| Species | Silphium asteriscus |
Similar in genus Silphium
Answers based on plant encyclopedia data
