General Plant Information (Edit)
Plant Habit: Herb/Forb
Life cycle: Perennial
Water Preferences: Mesic
Dry Mesic
Minimum cold hardiness: Zone 5a -28.9 °C (-20 °F) to -26.1 °C (-15 °F)
Plant Height: 12 to 18 inches (30-45 cm)
Leaves: Spring ephemeral
Flowers: Showy
Flower Color: Pink
Flower Time: Spring
Late spring or early summer
Foliage Mound Height: 7 to 12 inches
Underground structures: Rhizome
Dynamic Accumulator: K (Potassium)
Ca (Calcium)
Na (Sodium)
Pollinators: Bees
Various insects
Awards and Recognitions: RHS AGM

Common names
  • One-leaf Onion
  • One-Leaved Onion
  • Oneleaf Onion
  • American Onion
Botanical names
  • Accepted: Allium unifolium
  • Synonym: Allium grandisceptrum

Discussion Threads about this plant
Thread Title Last Reply Replies
Mis-ID, not even close to Allium unifolium. by AntMan01 Apr 2, 2018 11:24 PM 6
Mis-ID by AntMan01 Apr 2, 2018 11:22 PM 0

« Add a new plant to the database

« The Plants Database Front Page

Today's site banner is by arctangent and is called "Punchy pink"

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.