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Key characteristics

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

Bulbs

Allium 'Purple Rain'

Purple Rain Ornamental Onion

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.

Light

Full sun

Water

Low; prefers well-drained soil

Bloom time

Late spring to early summer

Find this plant

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.