Sunflower, Mongolian Giant
- Annual flowers with edible seeds
- Plants grow to 12-14 feet tall
- Flower heads grow to 16-18 inches across
- Seeds grow to 1.5 inches long
- 90 days
(H. annuus) One of the largest-seeded varieties available to gardeners, seeds up to 1½" long. Great for eating. Plants can grow 12-14' tall with gigantic yellow heads reaching 16-18" across! Annual, 90 days.
Learn to Grow it
Direct Seed: 1/8" Apart
Plant Outdoors: 4-8” Apart
Germination: 5-30 Days
Light: Full Sun - These plants prefer warm weather and soil so they should be grown when temperatures are over 68 degrees F.
Sunflowers do best when planted directly into your garden soil after the last frost of your spring season. Pick a spot that will have full sun, well-drained soil, and that is protected from the wind to grow your sunflowers. This variety may need support as it grows. We recommend planting your seeds about 1/2 of an inch deep, 6 inches apart and in rows that are 24-36 inches apart. The sunflower seeds will germinate in 10-14 days and should be mature in about 90 days.