Allium cowanii Allium cowanii
- Ornamental Onion
This spring bulb reproduces by annual daughter bulb replacement and seed and requires a warm (68 to 73 degrees F) to cool (35 to 50 degrees F) to warm (60 degrees F) annual thermoperiodic cycle. Flowers in the late spring (May) and lasts 2-3 weeks. Flowers are about 16 inches tall with large multi-flowered umbels. The plant tolerates summer drought, but keep the plant moist during growing season. It is normally not susceptible to animals.
The bulbous herb has a characteristic onion or garlic odor. Its leaves are long, slender, flat or cylindrical and hollow. Flowers are small, 6-parted, and in a cluster at the top of a naked stem.
Season: Plant in fall, flowers in late spring
Light: Full sunlight only
Found in: Forest and natural areas, as native herbaceous plants; landscape as cultivated perennial; weedy in disturbed areas
Depth: 5 in. to base of the bulb
Usage: Perennial beds, rock gardens, ground covers, and cut flowers
Organ: Tunicated bulb
Hardiness: Tender III - Injured at temperatures below 35 degrees F (2 degrees C) when planted
Space: 4 in. apart, 9 bulbs per sq. ft.
Flowering Period: Late Spring (May)
- Life Cycle:
- Recommended Propagation Strategy:
- Country Or Region Of Origin:
- Southern Europe and northern Africa
- Particularly Resistant To (Insects/Diseases/Other Problems):
- normally not susceptible to animals, drought
- EDIBLE PARTS: Leaves, bulbs, and bulblets. Field garlic (A. vineale) is too strong for most tastes. HARVEST TIME: Only collect plants from areas you know have NOT been treated with pesticides. Gather leaves during spring and fall. Gather bulbs in the second year when they are large enough to use like cultivated onions. Flower stem bulblets are collected during the summer. SAFE HANDLING PROCEDURES: Wash leaves, bulbs and bulblets in warm water to remove dirt and debris. Do not use dish detergent or any type of sanitizer. These products can leave a residue. Use as domestic onions, for seasoning, or raw in salads. Bulbs can be used raw, boiled, pickled, or for seasoning. Their strong taste can be reduced by parboiling and discarding the water. To freeze onions or garlic, one should coarsely chop, blanch two minutes, drain, pat dry, and place them into plastic bags. The bulbs can also be dried for use as seasoning. Use flower bulbs to flavor soup or for pickling.
Whole Plant Traits:
- Plant Type:
- Full Sun (Direct sunlight 8+ hours a day)
- Available Space To Plant:
- Less than 12 inches
- Flower Color:
- Flower Inflorescence:
- Flower Value To Gardener:
- Good Cut
- Flower Bloom Time:
- Flower Description:
- Flowers in the late spring (May) and lasts 2-3 weeks. Flowers are about 16 inches tall with large multi-flowered umbels. Flowers are small, 6-parted, and in a cluster at the top of a naked stem. This plant smells of onion or garlic.
- Leaf Value To Gardener:
- Hairs Present:
- Leaf Description:
- Its leaves are long, slender, flat or cylindrical and hollow. This plant smells of onion or garlic.
- Stem Is Aromatic:
- Landscape Theme:
- Rock Garden
- Resistance To Challenges:
- Poison Severity:
- Poison Symptoms:
- CAUSES ONLY LOW TOXICITY IF EATEN. Symptoms may include: nausea, vomiting, and diarrhea. Poisonous through ingestion. (Poison parts: All parts; bulbs, bulblets, flowers, and stems)
- Poison Toxic Principle:
- Causes Contact Dermatitis:
- Poison Part: