True Blue: Five Stunning Blue Flowers for Your Garden

Cool blue blooms provide a serene counterpoint to fiery reds and oranges. Here are five exceptional cultivars—each with specific needs—to anchor a blue-themed border.

1. Aconitum (Monkshood)

Warning: Toxic—avoid where children or pets play. Plant in partial shade at the back of borders for tall, vibrant violet spikes. Prefers moist, rich soil. Sturdy stems rarely need staking unless fully exposed.

2. Agapanthus (African Lily)

South African native demanding fertile, well-drained soil and full sun. Amend heavy soil with sand or humus to 12 inches deep. Tall flower heads (1m+) require staking against wind. Giant snowflake-like umbels reward careful placement.

3. Delphinium

Elegant vertical towers of flowers on thick stems. Loves full sun but hates wind—stake generously. Plant in a hole twice the pot size lined with bone meal. Water regularly and watch for slugs on spring growth.

4. Iris

Remarkably versatile: from desert to pond margins. All need full sun. Three recommendations:
• Siberian Iris: Hardiest for UK gardens, tolerates poorer soil.
• German Bearded: Adaptable to average fertility and moisture.
• Japanese Iris: Thrives in damp, rich soil—ideal for pond edges.

Foliage varies: rhizomatous types have sword-shaped leaves; bulbous types have cylindrical leaves.

Match each cultivar to your microclimate for a succession of blue from spring to summer.