Helianthus giganteus - Giant perennial sunflower

🌿 Characteristics

Type: Herbaceous perennial
Common Name: Giant sunflower
Scientific Name: Helianthus giganteus
Flower Color: Golden yellow
Mature Height: 1.5–2.5 m (5–8 ft)
Mature Width: 0.6–0.9 m (2–3 ft)
Habit: Upright, branched
Flowering Period: Late summer to autumn
Exposure: Full sun
Water Needs: Moderate to regular
Soil Type: Well-drained, fertile
Hardiness Zone: Zones 4 to 9
Drought Tolerance: Good once established
Nectar-rich plant: Yes
Attracts Pollinators: Yes
Toxicity to Animals: Non-toxic

✂️ Care

Very easy to cultivate. Stake stems early in growth to ensure optimal stability against strong winds. Remove spent flowers regularly to encourage prolonged and sustained blooming.

Apply an organic mulch around the base to maintain consistent moisture and regulate soil temperature. Light fertilization at the beginning of the season supports vigorous growth and generous blooms.

This spectacular perennial offers an imposing presence as a background plant in borders or as a natural screen, with its large golden yellow flowers creating bright and warm focal points from late summer until the first frosts. Ideal for natural and cottage-style gardens.