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Sunflower Seeds, Mongolian Giant
Description
(Helianthus annuus). A behemoth sunflower variety, with heads that are 12-18 inches across sitting atop 14 foot tall stalks! Huge, highly nutritious seeds are 1” long, more than twice the average sunflower seed size, perfect for snacking or feeding the birds!
- Annual
- 90-100 days to maturity
- 8-12 hours of full sun
- Sprouts in 7-14 days
- Seed Depth: 2"
- Plant Spacing: 18-24"
- Ideal Temperature: 65-75 F
- Frost Hardy: No
Growing Tips, Tricks and FAQs
Growing Tips
The Mongolian Giant sunflowers thrive in full sun, needing at least 8 hours of sunlight per day. While they tolerate a range of soils, they perform best in rich soil with moderate soil moisture. Although drought-tolerant once established, regular watering during early growth and flowering periods ensures healthier blooms and stronger plants.
When to Grow
Direct sow seeds outdoors after the last frost, typically in mid to late spring when soil temperatures are at least 60 F. In cooler climates, you can start seeds indoors 2-3 weeks before the last frost. Check your local frost dates for a more precise planting time.
How to Sow and Plant
Plant seeds about 2 inches deep, spacing them 18-24 inches apart to give the large plants room to grow. Choose a sunny spot and ensure the soil is well draining and rich in organic matter.
How to Grow
These sunflowers are heavy feeders, so mix compost or organic fertilizer into the soil before planting. Water deeply but infrequently, letting the soil dry between waterings. As the plants grow taller, you may need to stake them for support, especially in windy areas.
How to Save
- When petals die back and heads begin to dry and turn brown, place a paper bag over the heads to protect seeds from birds.
- After a few days, the heads will dry to a dark brown. Bring the heads indoors and hang them upside down in a dry area in direct sunlight for up to a week, shaking seeds free each day.
- Store in a cool, dark, dry place.
FAQ
Can Mongolian Giant sunflowers grow in containers?
Due to their massive size, Mongolian Giants are not ideal for containers. They need ample space, both for their deep taproots and their height, making them better suited for garden beds
Do Mongolian Giant sunflowers need staking?
Yes, due to their height and heavy flower heads, staking is often required to prevent them from toppling over.
When are Mongolian Giant sunflower seeds ready for harvest?
Seeds are ready when the back of the flower head turns brown and the seeds are firm to the touch.
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