Plant Ornamental Onion 'Serendipity' (Allium × 'Serendipity') where you want dependable midsummer color and a clean, compact habit. You get a neat, mounding clump of blue-green foliage topped by sturdy stems that hold tight, globe-shaped clusters of rosy-purple blooms. It typically finishes about 15-20 inches tall with a 10-15 inch spread, so it tucks easily into front borders, edging, and containers without flopping.

Give it full sun for the heaviest bloom, but it will also grow in part shade. Choose well-drained soil and avoid spots that stay soggy, especially in winter. Water regularly the first season to establish; after that, water during extended dry spells. A light spring feeding and a top-dressing of compost are usually plenty for steady growth and flowering.

Deadhead spent blooms if you want a tidier look and to encourage more flowering. If you enjoy seed heads, leave them for late-season texture, then cut back the stalks and foliage once it declines. Divide clumps when they become crowded to maintain vigor and keep plants looking fresh.

This ornamental onion is a strong choice for mixed plantings: it pairs well with summer perennials and grasses, and it is often avoided by deer and rabbits. Space plants about 12-15 inches apart to let the clumps fill in while keeping good air flow.

Specifications

• Cold hardiness zone: 4-8 (-30 degrees F) - Contact your local extension to confirm hardiness if you are in a fringe zone (we cannot guarantee hardiness in fringe zones)
• Light: Full sun   Part sun
• Growth rate: Moderate
• Mature height: 15-20"
• Spread: 10-15"
• Tolerant of: Deer, Rabbits
• Edible: Yes

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