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A. Flowering Characteristics
A. cowanii flowers in the late spring (May) and
lasts 2-3 weeks. Plants are about 16 inches tall
with large multi-flowered umbels.
B. General Characteristics
1. Origin of species: Southern Europe and Northern
Africa.
2. Common names: Ornamental Onion
3. Geophyte organ: Tunicated bulb
4. Hardiness type: Tender III - Injured at temperatures
below 35 degrees F (2C) when planted.
5. Natural reproductive systems and growth and
development requirements: A. cowanii reproduces
by annual daughter bulb replacement and seed and
requires a warm (68 to 73F) - cool (35 to 50F)
- warm (60F) annual thermoperiodic cycle.
6. Primary uses: Perennial beds, rock gardens,
ground covers and cut flowers.
C. Cultural Information
1. Bulb sizes: 4/5 and 5/up cm, in circumference.
2. Planting density: 4 inches apart, 9 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
8 with mulch, Zones 9 to 10 without mulch.
6. Light requirements: Full sunlight only.
7. Moisture: Tolerates summer drought, but keep
moist during growing season.
8. Animal susceptibility: Normally not susceptible.
D. Companion Plants:
Annuals, Alyssum, Arabis,Coreopsis,Hemerocallis,
Hosta cvs., Iris (rhizomatous), Kniphofia, Rudbeckia,
Sedum, Stokesia, Verbascum, Verbena, Zephyranthes,
Buddleia, Cleyera, Hypericum, Oleander, Illicium,
Pittosporum, Rhododendrum spp., Spiraea spp.,
Weigela.
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