40 Perennial Plants to Create Your Perfect Summer Garden

25. Delphinium

When it comes to blue flowers, Delphinium stands in a league of its own. A staple in traditional English gardens, this perennial boasts striking spikes adorned with uniquely horn-shaped flowers that exude old-world charm.

Some alpine varieties can soar to heights of up to six feet, making them perfect for creating a dramatic backdrop in garden beds. Delphinium flowers typically flaunt vibrant blues to violets, creating a truly enchanting spectacle, especially when they reach their full height.