Allium siculum ssp. bulgaricum

One of the most distinctive and elegant ornamental alliums, Allium siculum ssp. bulgaricum produces graceful nodding bell-shaped flowers in unusual shades of soft green, cream and dusky burgundy-purple.

Held in loose umbels on tall arching stems, the flowers have a wonderfully natural and almost exotic appearance, bringing movement, texture and architectural interest to the late spring and early summer garden. As the blooms mature, they gently sway in the breeze, adding a relaxed and informal character to borders and naturalistic planting schemes.

Native to the Mediterranean and Balkan regions, this remarkable plant was formerly classified as Nectaroscordum, and it remains highly prized by gardeners for its unusual colouring and striking flower shape.

Perfect for cottage gardens, prairie planting, woodland edges and gravel gardens, it combines beautifully with ornamental grasses and herbaceous perennials. The nectar-rich flowers are highly attractive to bees and pollinators, while the decorative seed heads continue to provide interest long after flowering.

Easy to grow and wonderfully unique, Allium siculum ssp. bulgaricum is ideal for gardeners looking to add something truly special and architectural to sunny borders.

Planting Instructions

When to Plant:

Plant bulbs in autumn (September–November) before the ground freezes. This allows roots to establish for strong flowering the following season.

Where to Plant:
Choose a position in full sun or light partial shade with well-drained soil. Allium siculum is ideal for cottage garden borders, prairie planting, gravel gardens and naturalistic schemes.

How to Plant:

• Depth: Plant bulbs about 10–15 cm (4–6 inches) deep.
• Spacing: Space bulbs about 15–20 cm (6–8 inches) apart.
• Soil Prep: Improve soil with compost. In heavier soils, add grit or sharp sand to improve drainage.

Watering:
Water after planting. Once established, bulbs require very little additional watering unless conditions are particularly dry.

Aftercare Tips:

• Allow foliage to die back naturally after flowering to feed the bulb.
• Leave decorative seed heads standing for additional architectural interest.
• Avoid excessive winter moisture to prevent bulb rot.

Top Tip:
Plant amongst ornamental grasses and airy perennials where the unusual nodding flowers can move naturally and be appreciated up close.

Plant Details

Flowering Period:
May – June (depending on season and conditions)

Height:
32–48" (80–120cm) (approx.)

Position:
Full sun or light partial shade

Hardy Perennial