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Ornamental Onion Allium neapolitanum

Previously known as:

  • Allium cowanii
Phonetic Spelling
AL-ee-um nee-ah-pol-ih-TAY-num
This plant has low severity poison characteristics.
See below
Description

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. Plant in fall, 4 in. apart, 9 bulbs per sq. ft., to a depth of 5 in. to base of the bulb. They will flower in middle to late spring

Found in: Forest and natural areas, as native herbaceous plants; landscape as cultivated perennial; weedy in disturbed areas

Organ: Tunicated bulb

Hardiness: Tender III - Injured at temperatures below 35 degrees F (2 degrees C) when planted

More information on Allium.

Cultivars / Varieties:
Tags:
#fragrant#white#sun#bulb#poisonous#full sun#fragrant flowers#drought tolerant#white flowers#spring bulb#cut flowers#spring flowers#full sunlight#plant in fall#Tunicated bulb#rock garden#groundcover#woodland#naturalizes#borders
 
Cultivars / Varieties:
Tags:
#fragrant#white#sun#bulb#poisonous#full sun#fragrant flowers#drought tolerant#white flowers#spring bulb#cut flowers#spring flowers#full sunlight#plant in fall#Tunicated bulb#rock garden#groundcover#woodland#naturalizes#borders
  • Attributes:
    Genus:
    Allium
    Species:
    neapolitanum
    Family:
    Amaryllidaceae
    Life Cycle:
    Perennial
    Recommended Propagation Strategy:
    Seed
    Country Or Region Of Origin:
    Southern Europe and northern Africa
    Particularly Resistant To (Insects/Diseases/Other Problems):
    normally not susceptible to animal damage, drought
    Edibility:
    Leaves, bulbs, and bulblets. 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. 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:
    Bulb
    Poisonous
  • Cultural Conditions:
    Light:
    Full sun (6 or more hours of direct sunlight a day)
    Available Space To Plant:
    Less than 12 inches
  • Flowers:
    Flower Color:
    White
    Flower Inflorescence:
    Umbel
    Flower Value To Gardener:
    Fragrant
    Good Cut
    Flower Bloom Time:
    Spring
    Summer
    Flower Shape:
    Radial
    Flower Petals:
    6 petals/rays
    Flower Size:
    1-3 inches
    Flower Description:
    Flower blooms in the middle to late spring (May to June). Flowers are small, 6-parted, and in a cluster at the top of a naked stem. Smells of garlic or onion. It is 15" tall with a loose umbel of white flowers.
  • Leaves:
    Leaf Color:
    Green
    Leaf Value To Gardener:
    Fragrant
    Leaf Type:
    Simple
    Leaf Arrangement:
    Rosulate
    Leaf Margin:
    Entire
    Hairs Present:
    No
    Leaf Length:
    > 6 inches
    Leaf Width:
    < 1 inch
    Leaf Description:
    Leaves are basal 20" long and 1" wide, slender, flat or cylindrical and hollow. Smells of garlic or onion.
  • Stem:
    Stem Is Aromatic:
    No
  • Landscape:
    Landscape Location:
    Naturalized Area
    Woodland
    Landscape Theme:
    Drought Tolerant Garden
    Rock Garden
    Design Feature:
    Border
    Resistance To Challenges:
    Drought
    Problems:
    Weedy
  • Poisonous to Humans:
    Poison Severity:
    Low
    Poison Symptoms:
    CAUSES ONLY LOW TOXICITY IF EATEN. Poisonous through ingestion. Symptoms may include nausea, vomiting, and diarrhea. (Poison parts: All parts; bulbs, bulblets, flowers, and stems)
    Poison Toxic Principle:
    Sulfides
    Causes Contact Dermatitis:
    No
    Poison Part:
    Bark
    Flowers
    Fruits
    Leaves
    Roots
    Seeds
    Stems