Northwest Blooms · Bulbs
Allium 'Purple Rain'
Purple Rain Ornamental Onion
- Family
- Amaryllidaceae
- Height
- 2 to 3 feet
- Width
- 1 to 2 feet
- Flower color
- Large, spherical purple flower heads
- Foliage color
- Strap-like, gray-green leaves
- Bloom time
- Late spring to early summer
- Light
- Full sun
- Water
- Low; prefers well-drained soil
- Maintenance
- Low; cut back after flowering
- Growing zone
- USDA zones 4 to 8
- Wildlife
- Attracts bees, butterflies, and other pollinators
About this plant
Allium 'Purple Rain' is an ornamental onion prized for its giant, spherical flower heads composed of deep purple, star-shaped blooms. Flowering in late spring to early summer, the impressive, airy flower clusters sit atop tall, slender stems, creating a dramatic and architectural presence in the garden. The vibrant purple color contrasts beautifully with surrounding greenery, making it a standout feature in borders or mixed plantings.
Originating from hybridization efforts, 'Purple Rain' combines the best traits of Allium christophii and Allium 'Purple Sensation', resulting in a plant with robust blooms and excellent garden performance. Its long-lasting flowers and bold structure make it an excellent choice for adding vertical interest, and its seed heads can be left to dry, offering additional ornamental value.
Works well in
Borders · Sun Gardens · Containers · Cut Flower Gardens · Pollinator Gardens
Companion plants
Lavender · Coreopsis · Russian sage · Sedums · Peonies · Coneflowers
Design tip
The long summer show pairs well with plants that peak earlier, keeping one area interesting for months. Plant in generous groups rather than single spots, and set them among perennials whose new growth covers the fading foliage.
Where to see it
This plant can be seen in the perennial border at the Bellevue Botanical Garden.
