Allium Seeds — Allium rosenbachianum

The Sculptural Bloom of Allium

When Allium Rosenbach comes into bloom, its loose, starry flower globe steals the show. Rose-violet florets and fine projecting stamens give the head a wonderfully spiky shape, and at 10–12cm across it makes a striking feature above the leaves as they begin to fade.

Why Gardeners Love It

• 💜 Impressive flower heads — 10–12cm across, with rose-violet starry florets and fine projecting stamens
• 🌿 Hardy perennial — a lasting ornamental allium for sunny gardens
• 🌸 Eye-catching in groups — plant together for a bold, architectural display
• ✂️ Long-lasting cut flowers — enjoy the unusual flower stems indoors
• 🌱 A rewarding challenge — a special project for patient gardeners growing from seed

Growing Tips for New Zealand

Sow in spring or autumn in a free-draining seed-raising mix. Sow shallowly and keep the mix evenly moist, never waterlogged. For best germination, aim for 20–22°C; germination is expected in around 7–10 days under suitable conditions.

Grow seedlings on in a bright position, then plant in full sun with around 40cm spacing. Mature plants can reach about 90cm tall. Allium Rosenbach is a hardy perennial, but plants raised from seed can take a few years to flower as the bulb needs time to develop to flowering size. Once established, plant in groups for the best garden display. The flowers also make long-lasting cut stems.

What’s in the Packet

Each packet contains 10 seeds of Allium (Allium rosenbachianum).

📄 Want the full growing guide? The Allium Propagation Guide — a detailed digital PDF covering sowing times, germination, spacing, and much more, is available as an instant download. 🌱😊

📄 Want to go even deeper? The CHBotanics Propagation from Seeds Manual — Professional Edition — a comprehensive digital PDF covering sowing times, germination, spacing, and much more across dozens of flower and vegetable species, is available as an instant download. 🌱😊