Water
Water regularly, especially during dry periods, to keep the soil consistently moist but not waterlogged. Allow the top inch of soil to dry out slightly between waterings.
Reduce watering in fall as the plant enters dormancy.
Also known as Forest Sunflower · Heliopsis Scarbra · Pale Sunflower
Helianthus decapetalus, the Thinleaf Sunflower, features masses of daisy-like yellow flowers in late summer. Adaptable and long-blooming, it suits meadows and borders.
At-a-glance light, water, soil, and growing conditions from plant data
Full Sun
100% intensity
Prefers at least 6-8 hours of direct sunlight daily.
Moderate
50% intensity
Keep soil consistently moist, avoid waterlogging.
Well-drained
50% intensity
Moderate
50% intensity
Thrives in average room temperatures; prefers cooler conditions in winter.
Low
25% intensity
Feed sparingly in spring with a balanced fertilizer.
Safety information from plant toxicity data
| Attribute | Value |
|---|---|
| Toxic for humans | No 0/5 intensity |
| Toxic for pets | No 0/5 intensity |
Non-toxic
Key traits and growing stats from plant data
Watering, pruning, propagation, and repotting details from plant data
Water regularly, especially during dry periods, to keep the soil consistently moist but not waterlogged. Allow the top inch of soil to dry out slightly between waterings.
Reduce watering in fall as the plant enters dormancy.
Deadhead spent flowers to encourage further blooming and prevent self-seeding. Cut back dead or damaged stems in late fall or early spring.
Prune to maintain desired shape and size, removing any weak or crossing branches.
Propagate by division of clumps in early spring or fall. Sow seeds indoors in early spring or directly outdoors after the last frost. Seeds may require stratification for best germination.
Repot young plants annually or bi-annually in spring to provide fresh soil and more space. Mature plants grown in the ground typically do not require repotting. Ensure pots have adequate drainage holes.
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Monthly activity intensity for bloom and fruit across both hemispheres.
Flowering & fruiting calendar
Flowering & fruiting calendar
Photos of Thinleaf Sunflower (Helianthus decapetalus)
Where Thinleaf Sunflower (Helianthus decapetalus) 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 | Helianthus |
| Species | Helianthus decapetalus |
Similar in genus Helianthus
Answers based on plant encyclopedia data
