Medusa is a playful ornamental onion named for its snaky, twisting leaves and curled flower buds. The nodding buds look like little serpent heads at the stem tips before they straighten and open into rounded clusters of light amethyst purple flowers in late summer.
It forms a low mound of narrow gray-green foliage about two feet tall in bloom, making it a fun choice for rock and herb gardens, border fronts and containers. Butterflies and bees visit the nectar-rich flowers, while deer and rabbits avoid the onion-scented leaves.
What it looks like
Rounded flower clusters 1.75 to 2 inches across made of many tiny starry florets in light amethyst purple, held on slender stems; before opening, the buds nod and curl at the stem tips. Leaves are narrow, gray-green, grassy blades that twist and curl toward their ends, forming a low, loose mound. The plant is 20 to 24 inches tall in bloom and about 24 inches wide. At peak bloom purple balls float above a swirl of twisted gray-green leaves.
Growing it with lavender
Medusa grows well in the same sunny, lean, well-drained spots as lavender, and its twisty gray-green leaves and amethyst globes add playful texture in front of lavender and bloom after its first flush.
Care
Grow in full sun to part shade in lean to average, well-drained soil; it handles drought once established. Hardy in USDA zones 4-8. Trim off any tired foliage in fall or early spring; clumps can be divided in spring every few years.
At a glance
-
Botanical name: Allium
-
Flower color: Light amethyst purple
-
Foliage: Gray-green
-
Growth habit: Low, loose mound of twisting leaves
-
Mature size: 20–24 in tall × 24 in wide
-
USDA hardiness zones: 4–8
-
Light: full sun, part sun to part shade
-
Bloom start: Early-August
-
Peak bloom: Mid-August
-
Bloom pattern: Single Flush
-
Deer resistance: Resistant
-
Pollinator value: Excellent
Sizes and shipping
Dormant bare-root plant, sold in boxes of 25 per variety (order in multiples of 25). Bare-root plants ship or are picked up March 1–May 31 only. They are soil-free, so they may ship to every state in that window. Dormant plants often show little or no top growth on arrival; plant or heel them in promptly.