Reviewing
Ammi Majus Seeds26 Feb 2026
Quick Germination
Happy with how quick and easy germination was.
Robbie P.Verified buyer
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 Extra Care
- Sun Loving
- 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
For standard delivery, we’ll work with our delivery partners to ensure you receive your delivery within 2-5 working days.
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.
Gifting
Want to send this as a gift? We can include a handwritten note, just add what you'd like to write at checkout.
If you’re worried about your delivery or have any other questions please get in touch via our contact page and one of our team will come back to you as soon as we can.
For more information on our shipping services, have a look at our FAQs.
Grow in Your Garden
Grow Majestic Giant Sunflowers with Herboo
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4.7
Based on 3 reviews
100% would recommend this product
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3 reviews
Reviewing
Roman Chamomile Seeds21 Feb 2026
Bought Chamomile
I haven't planted the seeds yet but if they're as good as the ones I've brought in the past I'll be more than happy.
Fred J.Verified buyer
Reviewing
Cornflower Seeds21 Feb 2026
LOVED
Got sent them as a gift and loved the instructions on sowing - very helpful
Posey C.Verified buyer