Also known as Thick-Tooth Sunflower · Thick-Toothed Sunflower
Helianthus grosseserratus (Sawtooth Sunflower) is a tall, sturdy perennial native to North America, featuring bright yellow flowers that attract pollinators.
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 for optimal growth and blooming.
Moderate
50% intensity
Water deeply when the top inch or two of soil feels dry. Drought-tolerant once established.
Well-drained, Loam, Sand, Clay
50% intensity
Moderate
50% intensity
Thrives in average to warm temperatures. Frost tolerant once established, but prefers warmer seasons for active growth.
Low
25% intensity
Requires minimal fertilization. Compost or a balanced fertilizer in spring is usually sufficient.
Safety information from plant toxicity data
| Attribute | Value |
|---|---|
| Toxic for humans | No 0/5 intensity |
| Toxic for pets | No 0/5 intensity |
Key traits and growing stats from plant data
Watering, pruning, propagation, and repotting details from plant data
Water regularly, especially during establishment and dry periods. Allow the top 2-3 cm of soil to dry out between waterings. Once established, it is drought-tolerant but performs best with consistent moisture.
Avoid waterlogged conditions, which can lead to root rot.
Pruning is not essential for plant health but can be done to manage size or improve appearance. Deadheading spent flowers can encourage reblooming and prevent self-seeding.
Cut back stems to the ground in late fall or early spring before new growth emerges.
Sawtooth Sunflower is easily propagated by seed sown directly outdoors in early spring after the last frost, or started indoors a few weeks prior. Division of established clumps in early spring or fall is also effective.
The plant readily self-seeds.
Repotting is generally not applicable for mature, established plants as they are typically grown directly in the ground.
If growing from seed or transplanting young plants, use a well-draining potting mix in a container that allows for root development. Ensure adequate space for future growth.
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Monthly activity intensity for bloom and fruit across both hemispheres.
Flowering & fruiting calendar
Flowering & fruiting calendar
Photos of Sawtooth Sunflower (Helianthus grosseserratus)
Where Sawtooth Sunflower (Helianthus grosseserratus) 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 grosseserratus |
Similar in genus Helianthus
Answers based on plant encyclopedia data
