Giant Veg Guinness World Record holder Kevin Fortey talks us through how to grow a giant sunflower...
Growing a giant sunflower head takes more than sunshine—it’s a test of skill, timing, and the right growing medium. Whether you’re aiming for a garden showstopper or a world record, Dalefoot Compost provides the perfect organic foundation for success.
Start with the Right Seed
Choose a giant variety. The genetics matter when aiming for maximum size and seed density.
Pick a Sunny, Sheltered Spot
Sunflowers thrive in full sun (6–8 hours daily) and benefit from wind protection—ideally near a south-facing wall or fence.
Ground or Pot?
Both work! In containers, use several bags of Dalefoot Wool Compost for strong root development and moisture control.
Sow Indoors Early
Use Dalefoot Seed Compost in 4-inch pots to start seeds in late winter or early spring. Transplant once frost risk has passed.
Prepare and Mulch the Soil
Dig deep and enrich with Dalefoot Double Strength Wool Compost. Mulch with Veg & Salad Compost to retain moisture and feed steadily.
Water & Feed Regularly
Water deeply, especially when the flower bud forms. Add a high-potassium feed and continue mulching to boost flower size.
Support and Prune
Stake early and remove side shoots to focus energy into one huge flower head.
Pollinate and Protect
Encourage bees or hand-pollinate if needed. Support the heavy head as it matures to prevent snapping.
Harvest and Share
When seeds mature and the back of the head turns yellow-brown, harvest and weigh! Share your giant with us using
#DalefootSunflower and #GiantSunflower.
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Top Tip: Dalefoot’s peat-free composts made from wool and bracken deliver slow-release nutrients, excellent water retention, and sustainable results—perfect for growing your garden’s biggest showpiece!
Kevin
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We'll be giving away a packet of giant sunflower seeds (first come first served) at RHS Chelsea flower show Stand no EAE548, come say hello!