sunflower Strumosus

Helianthus strumosus

Helianthus strumosus is a perennial herbaceous plant native to North America, featuring the following characteristics and cultivation information.

Growth Characteristics
- Scientific Name: Helianthus strumosus
- Height: Approximately 1–2.5 m
- Flowers: Small yellow flowers bloom from summer to early autumn.
- Leaves: Ovate or elliptical, with hairs on the underside.
- Roots: Tuberous roots that spread deeply and form colonies.

Propagation Methods
- Seed Propagation: Harvest mature seeds in the autumn and sow them directly, or germinate them indoors in the spring and transplant them.
- Root Division: Propagation can be performed by dividing the tubers, which is done in the spring or autumn.

Cultivation Methods
- Soil: Well-drained, fertile sandy or clayey soil is suitable.
- Sunlight: Requires sufficient sunlight, but can also grow well in partial shade. - Watering: It prefers relatively dry conditions, so excessive watering should be avoided.
- Fertilization: Apply a small amount of slow-release fertilizer in the spring.

Garden Use
- Landscape Creation: Due to its tall stature and unique flower shape, it is excellent for planting as a garden backdrop or along hedges.
- Animal Attraction: It helps attract pollinators such as bees and butterflies.

Important Pests and Control Methods
- Diseases: Rust and powdery mildew may occur; to prevent this, plant in a well-ventilated location and avoid overwatering.
- Pests: Aphids and caterpillars may occur; upon early detection, use soapy water or an appropriate concentration of insecticide.
- Prevention: Reduce pest and disease occurrences through regular weeding and tidying the area around the plant.

When properly cared for, the Strumosus sunflower grows beautifully in the garden and offers various ecological values.

Plant Family	Asteraceae
Height	90~150cm
Spread	30~60cm
Colors	yellow
Bloom Period	July~August
Water Needs	commonly
Exposure	Sunny
Freezing Resistance	-40°C

Baby sunflower
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Helianthus pauciflorus