We're offering you a 9 or 18 Festival Summer Bulbs for £7.99, saving you up to 43% off Thompson and Morgan's's price of £13.99 (correct as of 17.02.2026).

Summer Garden Bulb Blend

Transform your garden into a summer festival of colour with the Festival Summer Flowering Bulb Mix. This vibrant selection features hand-picked dahlias, graceful callas, and striking gladioli—each renowned for their dazzling blooms and unique textures. Whether you’re looking to fill borders, brighten patio pots, or create show-stopping cut flower arrangements, this blend brings continuous visual interest all season long.

Why Choose the Festival Summer Bulb Blend?

• Botanical Variety: Dahlias (Dahlia spp.) offer bold, multi-petalled flowers; Callas (Zantedeschia spp.) provide elegant, trumpet-shaped blooms; Gladioli (Gladiolus spp.) deliver vertical spikes of colour.
• Seasonal Interest: Expect a rolling display of apricot, yellow, deep red and more from June through September.
• Low Maintenance: Once planted in well-drained soil and a sunny spot, these bulbs need little care—ideal for both new and experienced gardeners.

Planting & Growing Guide

• Planting Time: Set bulbs in the ground between March and May after the last frost.
• Location: Prefers full sun; suitable for borders or containers.
• Soil: Well-drained soil is best; enrich with compost before planting.
• Watering: Water regularly during dry spells but avoid waterlogged conditions.
• Mature Height: Depending on variety, expect heights from 40cm up to 100cm.

Caring for Your Bulbs

• Dahlias: Pinch out tips to encourage bushier growth. Deadhead faded blooms to prolong flowering. Lift tubers in autumn if winters are harsh.
• Callas: Mulch in autumn or lift rhizomes in colder regions for winter storage.
• Gladioli: Stake taller varieties and lift corms after foliage dies back in autumn if frost-prone.

Add Style & Structure

This mix is perfect for adding height, colour, and texture to mixed borders. Pair with ornamental grasses or low-growing perennials like lavender or salvia for a striking display. Their long stems also make them ideal as cut flowers for indoor arrangements throughout summer.

FAQs

• When should I plant these bulbs?
  Plant outdoors between March and May after the risk of frost has passed.
• How tall will these flowers grow?
  Depending on the variety: dahlias and callas reach around 40–60cm; gladioli can reach up to 100cm.
• What type of soil do these bulbs prefer?
  All thrive in well-drained soil enriched with compost. Avoid heavy clay or waterlogged areas.