Giant Sunflower Care, Propagation, Watering & Growing Tips

Giant sunflower is a type of sunflower plant that is giant in shape and can grow to a height of over 13 feet with leaves about 1-7 inches wide with bright yellow flower heads. This plant is most commonly planted in valleys with wet meadows or swamps or can even be found near river banks.

Common Name

Giant Sunflower or Tall Sunflower
Plant Type
Perennials
Taxonomy
Scientific name
Helianthus giganteus
Genus
Helianthus
Family
Asteraceae
Order
Asterales
Class
Dicotyledons

Giant Sunflower Water Needs

Water requirements and watering times for Giant Sunflower.
Water Needs
Average
Cups
Generally, Giant Sunflower needs water once every 8 days in 1.8 cups.
1 Cup = 250 ml, so at least Giant Sunflower needs about 0.45 L per 8 days.

Giant Sunflower Temperature, Humidity, and Light

Ideal light, temperature & humidity needed for Giant Sunflower to thrive.

Light Requirements

± 6 hours

Temperature

70°F to 78°F

Humidity Preference

Medium

The ideal humidity range for your Giant Sunflower to thrive is between 40% and 60%.

Giant Sunflower Soil Types and Growing Media

Information about soil and suitable planting media for Giant Sunflower.

Suitability in pots

7L

Giant Sunflower plants require different pot sizes as they grow. Start with a small pot of 7L.

Soil type

clay loam sand
Soil Drainage
Moist but well-drainage

Soil PH

acid neutral

Giant Sunflower Characteristics

All you need to know about the characteristics of the Giant Sunflower plant.

Maximum Height

156 Inches or 4 meters

Spread

120 Inches or 4 meters

Color

Green
Bright Yellow

Characteristics

Cut Flowers Showy

Is Giant Sunflower toxic to pets?

No

Garden Style

City and Courtyard Coastal Garden Prairie and Meadow Patio And Containers

Giant Sunflower Grow and Care

Find out information on how to propagate Giant Sunflower, when it flowers, and how to care for it.

Maintenance

easy

Propagation Methods

seed stem cutting root division

Flowering season

autumn

Giant Sunflower Native Region

Find out where the Giant Sunflower plant originated.

Country

North America
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