Giant Sunflower Seeds
Helianthus Annuus 'Giant Single'
Giant Sunflowers, the tallest Helianthus Annuus variety, are perfect for growing in pots or gardens. These majestic yellow sunflowers can soar over 2m, symbolising growth and positivity. Ideal for sunflower races, our sunflower seeds to plant promise robust sunflower growth and a garden alive with bees, butterflies, and birds. Plant sunflower seeds that transform into golden, giant blooms, bringing life and joy to your space.
Approx 20 seeds
- Needs Love
- Likes Sun
- Cut Flowers
- Pollinator-Friendly
Giant Sunflower Seeds – Quick Growing Guide
Sunflower 'Giant Single' seeds produce tall, striking flowers ideal for brightening gardens. Sow from March to September directly outdoors or in pots. They thrive in full sun with well-drained soil, requiring moderate watering. Harvest seeds in late summer for snacking or replanting.
How to Sow, Grow and Harvest Giant Sunflower Seeds
- Sow:March–September, direct or in pots
- Germination:7–14 days
- Grow:Full sun, well-drained soil, support tall stems
- Water:Moderate, keep soil moist but not waterlogged
- Harvest:Late summer, when seed heads turn brown
- Best for:Beds, borders, cut flowers
Our giant sunflower seeds produce some of the tallest Helianthus Annuus varieties, reaching over 2 metres. Ideal for gardens and containers, these sunflowers attract bees, butterflies and birds, making your outdoor space vibrant and full of life. Their sunny yellow blooms symbolise positivity and growth, perfect for summer displays and sunflower races.
Delivered within 2-5 working days via our standard delivery
Standard Delivery
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Express Delivery
You can also send this item the next day, just place the order before 11 am and we'll get it sent out the same day to arrive the following day.
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Grow in Your Garden
Calendar
How to Grow
Start your giant sunflower seeds outdoors after the last frost in a sunny garden bed or container, where they will thrive in full sun. These tall sunflowers prefer well-drained soil and plenty of light to reach their majestic height throughout the summer months from June to September.
Sowing
Sow the seeds in pots or trays filled with damp seed compost, lightly covering them to encourage germination. Keep the containers in a warm, sunny spot during the sowing period from March to June to ensure good sprouting conditions.
Growing
Once seedlings have emerged, thin them out to allow enough space for each plant to grow to its full size, ideally in a 40 cm pot or well-spaced garden bed. Providing sufficient room supports the impressive spread and height typical of Helianthus Annuus 'Giant Single'.
Plant care
Keep the soil consistently moist but not waterlogged throughout the growing season. As these sunflowers grow tall, occasional support may be necessary to prevent bending. Deadhead spent flowers to encourage continued blooming and maintain the plant’s vigour during the summer months.
About Giant Sunflower
A classic, fast-growing annual that produces towering stems topped with huge golden blooms. Giant Single sunflowers are easy to grow from seed, thrive in full sun, and make a dramatic statement in borders, allotments, or wildlife-friendly gardens. Excellent for pollinators and perfect for growing with children.
- Needs Love
- Likes Sun
- Cut Flowers
- Pollinator-Friendly
Eventual height & spread
History of Giant Sunflower
Sunflowers represent loyalty and adoration, inspired by the myth of Clytie and Apollo. Their bright blooms follow the sun, symbolising happiness and making them a thoughtful summer gift.
| Other Names | Comb flower, golden, golden flower of Peru, St Bartholomew's star |
|---|---|
| Pet/Baby Safe | Pet + Baby Safe |
FAQs
They can reach over 2 metres tall.
Yes, they thrive in large pots with full sun.
Sow outdoors after the last frost for best results.