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A. Flowering Characteristics
1. caeruleum flowers in very late spring (May/June)
and lasts 2-3 weeks. Plants are 20 inches tall
with small multi-flowered umbels.
B. General Characteristics
1. Origin of species: North to Central Asia
2. Common names: Ornamental Onion
3. Geophyte organ: Tunicated bulb
4. Hardiness type: Hardy II - Injured at temperatures
below 14 degrees F (-10C) when planted.
5. Natural reproductive systems and growth and
development requirements: A. caeruleum reproduces
by annual daughter bulb replacement and seed and
requires a warm (68 to 73F) - cool (28 to 32F)
- warm (60F) annual thermoperiodic cycle.
6. Primary uses: Perennial beds, rock gardens,
meadows, ground covers, and fresh cut flowers.
C. Cultural Information
1. Bulb sizes: 4/5 and 5/up cm, in circumference.
2. Planting density: 2 inches apart, 15-25 bulbs
per sq. ft.
3. Planting depth: 5 inches to base of the bulb.
4. Planting time: Fall
5. Climatic zone habit: 1990 USDA Climatic Zone
4 with mulch, Zones 5 to 7 hardy without mulch.
6. Light requirements: Full sunlight only.
7. Moisture: Tolerates summer drought, but requires
moisture during growing season.
8. Animal susceptibility: Normally not susceptible.
D. Companion Plants:
Alyssum, Baptisia, Dryopteris erythrosora, Coreopsis,
Hemerocallis, Iris (rhizomatous), Kniphofia, Peonies,
Stokesia, Verbascum, Acer palmatum, Buddleia,
Cotoneaster, Deutzia gracilis, Kalmia, Rhododendron
spp., Spiraea spp., Viburnum, Weigela.
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