Oneleaf onion (Allium unifolium)

Oneleaf onion

Also known as: American garlic

Oneleaf onion (Allium unifolium) is a species of wild onion that comes from North America, primarily Oregon, California, and Baja California. The bulbs are typically egg-shaped and only about 2 cm long. Oneleaf onion grows well in clay-based soils under full sunlight. It is also occasionally known as American garlic.

Scientific classification

Species

Oneleaf onion (Allium unifolium)

Instantly identify plants with a snap

Snap a photo for instant plant ID, gaining quick insights on disease prevention, treatment, toxicity, care, uses, and symbolism, etc.

Download the App for Free

Perennial

Lifespan

Herb

Plant Type

Spring, Early summer, Mid summer

Bloom Time

30 cm

Plant Height

10 cm

Spread

Green, Gray, Silver, Pink

Stem Color

Deciduous

Leaf type

15 - 35 ℃

Ideal Temperature

Images of Oneleaf onion

Distribution of Oneleaf onion

Distribution Map

Oneleaf onion is a plant native to the temperate regions of North America. Beyond its indigenous range, it has been introduced to parts of Europe. Oneleaf onion is also cultivated in various regions, which may extend beyond its native and introduced habitat territories.

Native

Cultivated

Invasive

Introduced

No species reported

Discover plant distribution and habitat

Gain insights into where plants thrive and how they adapt, helping you identify, cultivate, and protect them with essential information on habitats, distribution maps, and climate trends.

Download the App for Free

Habitat

Pine or mixed evergreen forest

Hemisphere Trend Curve

Northern

Sorthern

Cultivars

There are several recognized cultivars of Oneleaf onion, including the following common varieties :

Oneleaf onion 'Eros'

Quickly Identify Oneleaf onion

Grass-like leaves in clusters

Taller stalks with lavender-pink flowers

Distinctive papery tepals around fruit

Leaves and flowers on separate stalks

Umbel structure with multiple flowers

Identify plants with a snap

Instantly identify plants with AI: Snap a photo, and get accurate results within seconds.

Download the App for Free

Care Guide for Oneleaf onion

Every week

Water

Full sun

Sunlight

15 - 35 ℃

Ideal Temperature

Garden Soil

Soil Type

Water: Oneleaf onion originates from North American meadows, preferring consistent moisture without waterlogging. Optimal watering is weekly to support growth. Typically grown outdoors, it thrives in well-drained gardens that mimic its natural habitat, emphasizing seasonal water availability for blooming and dormancy cycles.

Fertilize: Fertilize oneleaf onion with balanced nutrients early in the growing season, then switch to high phosphorus formulas as flowering nears. Apply every 4-6 weeks, avoid over-fertilization, and adjust for seasons. Always water before and after fertilization to prevent root burn and aid nutrient absorption.

Pruning: Oneleaf onion produces delicate, pink, star-shaped flowers and thrives in sunlight. Prune from early to late spring, removing dead foliage and faded stems to encourage growth and new blooms. Regular pruning boosts vigor, and sanitized tools are essential to prevent disease. Consult horticultural sources for tailored care tips.

Propagation: Oneleaf onion, part of the Amaryllidaceae family, is valued for its unique flowers. Propagate by dividing bulbs after foliage dies, ensuring each has one bulb. Plant in well-draining soil at three times the bulb's height. Provide regular water and minimize disturbance for healthy growth.

Repotting: Oneleaf onion requires excellent drainage when planted in pots to ensure healthy growth and prevent root rot.

Get tips and tricks for your plants.

Keep your plants happy and healthy with our guide to watering, lighting, feeding and more.

Download the App for Free