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Lactuca biennis
Also called Blue lettuce, Blue Wood Lettuce, Biennial Lettuce, Wild Blue Lettuce, Woodland Lettuce
Tall blue lettuce (Lactuca biennis) is a North American biennial wild lettuce in the daisy family, growing from a taproot to 0.5 to 4 m tall with light blue flower heads. It is a wild species of woodland and open ground rather than a common garden crop, so grow it for its flowers and interest.
Lactuca biennis is a North American species of wild lettuce known by the common names tall blue lettuce and blue wood lettuce. It is widespread across much of the United States and Canada from Alaska and Yukon south as far as California, New Mexico, and Georgia.
Lactuca biennis is a biennial herb in the dandelion tribe within the daisy family growing from a taproot to heights anywhere from one half to four meters (20 inches to over 13 feet). There are deeply lobed, toothed leaves all along the stem. The top of the stem bears a multibranched inflorescence with many flower heads. Each head is just over a centimeter (0.4 inches) wide and has many whitish to light blue ray florets but no disc florets. The fruit is a mottled achene about half a centimeter (0.2 inches) long with a brownish pappus.
Canada lettuce · Indian lettuce · Willowleaf lettuce · Celtuce · Iceberg lettuce · Romaine lettuce · Lettuce · Prickly lettuce · Bitter lettuce · Lettuce
Text excerpted from the Wikipedia article Lactuca biennis by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.
The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.
Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.
