Tall Double Sunflower Seeds (Helianthus annuus) | Giant Double Yellow Flowers | Mallorn Ireland

Grow spectacular golden blooms that tower above the garden with Tall Double Sunflower. This stunning annual produces large, fully double flowers on strong, upright stems, creating an impressive display from midsummer until autumn. Ideal for borders, wildlife gardens and cut flower arrangements, these towering sunflowers attract bees and butterflies while adding dramatic height and colour to any outdoor space.

Plant Details

• Botanical Name: Helianthus annuus
• Common Name: Tall Double Sunflower
• Plant Type: Annual
• Flower Colour: Golden Yellow
• Height: 200–300 cm
• Position: Full Sun
• Flowering Time: July – October

Growing Information

When to Sow

Sow directly outdoors from April to May once the risk of hard frost has passed and the soil has begun to warm.

How to Sow

Choose a sunny position with fertile, well-drained soil. Sow seeds 1–2 cm deep, spacing plants approximately 40–50 cm apart. Water after sowing and keep the soil lightly moist until seedlings are established.

Growing Tips

Water regularly during prolonged dry periods, particularly while plants are establishing. Feed occasionally with a balanced fertiliser to encourage vigorous growth and abundant flowers. Due to their impressive height, plants may benefit from staking in exposed locations. Deadhead spent blooms to extend the flowering season, or leave seed heads in place to provide food for garden birds.

Why You’ll Love It

• Produces spectacular fully double golden blooms.
• Grows an impressive 2–3 metres tall.
• Flowers continuously from July to October.
• Excellent for borders and creating dramatic garden displays.
• Perfect as a long-lasting cut flower.
• Attracts bees, butterflies and other beneficial pollinators.
• Makes an effective natural screen or windbreak.
• Easy to grow and suitable for gardeners of all experience levels.