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Allium hollandicum 'Purple Sensation'
purple sensation allium
Central Asia (Iran, Turkmenistan, Kyrgyzstan)
Overview
Allium hollandicum 'Purple Sensation' is a bulbous perennial reaching 24–36 inches (60–90 cm) tall and 6–10 inches (15–25 cm) wide, growing from a round bulb 1–2 inches (2.5–5 cm) in diameter. This cultivar of A. hollandicum produces deep violet-purple flower umbels, more uniformly colored than seed-grown populations. Basal leaves are strap-shaped, 10–16 inches (25–40 cm) long and 1–2 inches (2.5–5 cm) wide, gray-green. Foliage yellows and dies back during bloom, typically by late May in zones 6–7. Flower umbels are spherical, 3–4 inches (8–10 cm) in diameter, densely packed with 50–80 small star-shaped flowers on a sturdy, erect, leafless stalk. Bloom occurs May through June, with individual umbels lasting 2–3 weeks. Dried seed heads retain a spherical shape for several weeks after petals drop. Plants self-seed freely in open, well-drained soils, and seedlings generally reproduce true to color. Bulbs also multiply by offsets, forming small clusters over 3–5 years. Bulb rot develops in soils that remain wet during summer dormancy. Foliage decline during bloom leaves a gap in the planting that requires companion plantings to fill.
Native Range
The species A. hollandicum is native to central Asia, found in Iran, Turkmenistan, and Kyrgyzstan. Grows on dry, rocky slopes and steppe grasslands at 3,000–7,000 feet (900–2,100 m) elevation. 'Purple Sensation' was selected in the Netherlands for uniform flower color.Suggested Uses
Commonly planted in perennial borders, cottage gardens, and mass plantings at 6–8 inch (15–20 cm) spacing in groups of 10–20. Interplant with later-emerging perennials to mask dying foliage. Self-seeding habit suits naturalized and meadow-style plantings. Not suited to irrigated summer beds or heavy clay soils without drainage amendment.How to Identify
Appearance
Size & Dimensions
Height2' - 3'
Width/Spread6" - 10"
Reaches mature size in approximately 2 years
Bloom Information
Flowers May through June in zones 4–8. Individual umbels last 2–3 weeks; total bloom period extends about 3 weeks. In zone 8, bloom begins in late April. Bloom coincides with late spring perennials and early roses.
Detailed Descriptions
Foliage Description
Gray-green, strap-shaped, basalGrowing Conditions
Sun Requirements
Requires 6-10 hours of direct sunlight daily
• Full Sun: 6+ hours of direct sunlight
• Partial Shade: 3-6 hours of direct sunlight
• Full Shade: Less than 3 hours of direct sunlight
Care & Maintenance
Care Guide
Plant bulbs 4–6 inches (10–15 cm) deep in fall (September–November) in well-drained soil. Bulbs require dry summer dormancy; rot develops in heavy clay or irrigated beds that remain wet from June through September. Water during active spring growth; reduce irrigation after foliage yellows. No fertilization is needed in average soils. Self-seeds freely; remove spent heads before seeds disperse to control spread, or allow naturalization in informal plantings. Bulbs increase by offsets and naturalize over 3–5 years in favorable conditions.Pruning
Allow foliage to die back naturally; do not cut leaves until fully brown. Dried flower heads can be left for summer structural interest or removed in July. No other pruning is required.Pruning Schedule
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summer
Container Growing
✓ Suitable for container growing
Minimum container size: 3 gallons