Giant sunflower - Helianthus giganteus (Care, Characteristics, Flower, Images)

Giant sunflower

Also known as: Sunflower

Giant sunflower (Helianthus giganteus) is a perennial herbaceous plant that can grow to be over 4 m tall. Giant sunflower is native to the eastern United States and eastern and central Canada. This species grows in valleys with wet meadows or swamps.

Scientific classification

Species

Giant sunflower (Helianthus giganteus)

Asters bellflowers fanflowers and allies

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Perennial

Lifespan

1.5 m

Spread

Green

Leaf Color

7 cm

Flower Size

Yellow

Flower Color

Deciduous

Leaf type

5 - 35 ℃

Ideal Temperature

Images of Giant sunflower

Distribution of Giant sunflower

Distribution Map

Giant sunflower is a plant that is originally native to North America. Over time, it has been intentionally introduced to various parts of Europe and Asia, and also to regions of northern America outside its native range. It is also cultivated in regions beyond its native habitat, further expanding its presence globally.

Native

Cultivated

Invasive

Introduced

No species reported

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Habitat

Moist places, marshes

Hemisphere Trend Curve

Northern

Sorthern

Quickly Identify Giant sunflower

Impressive height of up to 8 feet (2.44 meters)

Robust, reddish, slightly hairy stems with no branching

Narrow lanceolate leaves with crenate edges, 3-5 inches (7.6-12.7 cm) long

Bright yellow flowers in loose clusters, 3 inches (7.6 cm) across

Vibrant yellow petals, 10-20 per flower

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Care Guide for Giant sunflower

Every week

Water

Full sun

Sunlight

5 - 35 ℃

Ideal Temperature

Garden Soil

Soil Type

Water: Adapted to moist meadows, giant sunflower thrives with consistent moisture and prefers wet soil but tolerates short dry spells. Water weekly and provide full sun exposure; additional hydration during peak growing season supports its robust growth and large blooms.

Fertilize: For optimal growth, giant sunflower requires balanced nutrition through quarterly fertilization, with high phosphorus for flowering. Adjust frequency seasonally and apply slow-release formulas to prevent root burn. Proper fertilization ensures robust stems and vibrant blooms, essential for giant sunflower's beauty.

Pruning: Giant sunflower is known for its height and vibrant yellow flowers. Prune from early to late spring by removing dead stems and thinning for better air circulation. Regular cutting back encourages bushier growth, enhances aesthetic appeal, and boosts plant vigor. Refer to guides for detailed techniques.

Propagation: Giant sunflower thrives in well-drained soil and full sun. To propagate, divide mature clumps in early spring or autumn, minimizing stress. Carefully separate the rootball and replant at the same depth, ensuring adequate spacing for future growth.

Repotting: Repot giant sunflower every 2-3 years in early spring using a large, deep pot to support its growth. After repotting, provide ample sunlight and moderate watering for optimal health. Following these guidelines will ensure a robust and thriving giant sunflower.

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