We're offering you a 5 or 10 Delphinium Pacific Hybrids for £4.99, saving you up to 71% off Thompson and Morgan's's price of £16.98 (correct as of 16.03.2026).

Hardy Perennial Delphinium

Transform your garden with the towering beauty of Delphinium 'Pacific Giants Mixed'. These renowned hybrids are hardy perennials, celebrated for their tall spires of densely packed flowers in blue, purple, pink, and white shades. Developed in the mid-20th century, the 'Pacific Giants' group brings classic cottage garden elegance and reliable performance year after year.

Why Grow Delphinium 'Pacific Giants'?

• Impressive Height: Mature plants can reach up to 1.8m (6ft), creating dramatic vertical accents.
• Spectacular Blooms: Flower spikes burst into colour from June to July, attracting pollinators and adding vibrant energy to borders.
• Lush Foliage: The palmate leaves form a dense base, enhancing the visual impact of the flower spikes.
• Cottage Garden Essential: Perfect for mixed borders, classic planting schemes, or as a stunning backdrop for roses, foxgloves, or lupins.

Growing Guide & Care Tips

• Planting Time: Best planted in spring or early autumn. Supplied as plug plants—pot on upon arrival and transplant outdoors once risk of frost has passed.
• Location: Choose a spot with full sun or partial shade; shelter from strong winds is ideal due to tall stems.
• Soil: Prefers deep, fertile, well-drained soil. Enrich beds with compost before planting.
• Irrigation: Water regularly during dry spells but avoid waterlogging.
• Staking: Support tall stems with canes or frames as they grow to prevent wind damage.
• Pruning: Remove faded flower spikes to encourage a second flush; cut back foliage in autumn after dieback.
• Feeding: Apply a balanced fertiliser in spring and again after flowering for best results.

The Perfect Border Plant

Add Delphinium 'Pacific Giants Mixed' to your perennial borders for instant height and drama. Their vertical form pairs beautifully with peonies, irises, and alliums. For a traditional English garden look, group in clusters at the back of beds or along fences where their blooms command attention.

FAQs

• When is the best time to plant Delphinium 'Pacific Giants'?
  The ideal planting times are spring or early autumn. Plug plants should be potted on immediately and planted out after the last frost.
• How tall do these delphiniums grow?
  Mature plants can reach heights up to 1.8m (6ft), making them perfect for adding structure to borders.
• What soil conditions do they prefer?
  'Pacific Giants' thrive in deep, fertile, well-drained soil enriched with organic matter. Avoid heavy clay or waterlogged sites for best results.