How to grow Giant Sunflower

Helianthus giganteus

Full Sun
OR
Partial Sun
Medium

Feed often and water regularly.

Growing Giant sunflower from seed

Water the soil and press the seeds 1" deep. Snail bates are very important and also cover with netting to protect emerging seedlings from birds.

Sow at a depth of approx. 0.99 inches (2.54 cm) and aim for a distance of at least 11.7 inches (30.0 cm) between Giant sunflower plants.

How long does Giant sunflower take to grow?

These estimates for how long Giant sunflower takes to sprout, grow and harvest are from real observations from real gardeners, right around the world.

Days to Germination How long does it take Giant sunflower to germinate?: 5 days
Average 5 days | Min 1 days | Max 22 days (18)
Days to Transplant How long until I can plant out Giant sunflower?: + 9 days
Average 9 days | Min 7 days | Max 21 days (3)
Days to Maturity How long until Giant sunflower is ready for harvest / bloom?: + 90 days
Average 90 days | Min days | Max days (0)
Total Growing Days How long does it take to grow Giant sunflower?: = 104 days

Giant sunflower Etymology

The botanical epithet is from the Latin giganteus meaning “huge” The botanical epithet is from the Latin helianthus meaning “sun-flower”

Other names for Giant sunflower

Tall sunflower, Giant, Russian Giant, Giant Greystripe, Mammoth

Misspellings: Giganteus