Lactuca canadensis is a Biennial found in areas such as Eastern N. America - Nova Scotia to British Columbia, south to Georgia and Colorado. A member of the Compositae family, Lactuca canadensis L is also known by its common name of Canada Lettuce. The Biennial can grow to a height of 3 meters and up to meters wide. The preferred habitat of Thickets, woodland borders and clearings[43]. Moist open places[235]. Usually found in sandy soils[274]., with LM soil and SN moisture levels. .

Canada Lettuce is a zone hardy plant that has medicinal uses - the medicinal usage rating of Canada Lettuce is 3The whole plant is rich in a milky sap that flows freely from any wounds. This hardens and dries when in contact with the air[4]. The sap contains 'lactucarium', which is used in medicine for its anodyne, antispasmodic, digestive, diuretic, hypnotic, narcotic and sedative properties[9, 21, 46, 165, 192, 207, 213, 222, 238]. Lactucarium has the effects of a feeble opium, but without its tendency to cause digestive upsets[4], nor is it addictive[7]. It is taken internally in the treatment of insomnia, anxiety, neuroses, hyperactivity in children, dry coughs, whooping cough, rheumatic pain etc[238]. Concentrations of lactucarium are low in young plants and most concentrated when . The plant comes into flower[238]. It is collected commercially by cutting the heads of the plants and scraping the juice into china vessels several times a day until . The plant is exhausted[4]. An infusion of the fresh or dried flowering
plant can also be used[9]. . The plant should be used with caution, and never without the supervision of a skilled practitioner. Even normal doses can cause drowsiness whilst excess causes restlessness[238] and overdoses can cause death through cardiac paralysis[7, 9]. Some physicians believe that any effects of this medicine are caused by the mind of the patient rather than by the medicine[213]. The sap has also been applied externally in the treatment of warts[222].

Lactuca canadensis is 0 plant, whose flowers bloom typically in 7 - 9, and which is pollinated by Insects.

Known hazards of the plant: Although no specific mention of toxicity has been seen for this species, many plants in this genus contain a narcotic principle, this is at its most concentrated when . The plant begins to flower. This principle has been almost bred out of the cultivated forms of lettuce but is produced when . The plant starts to go to seed[13].

The plant has an edibility rating of 2Young leaves and stems - raw or cooked[46, 55, 61, 85, 105, 177]. Cooked and eaten as greens[257].

Cultivation tips: Prefers a light sandy loam[1]. Hybridizes in the wild with L. ludoviciana and the two species can sometimes be difficult to separate[274].

. The plant should best be propagated by Seed - sow spring in situ and only just cover the seed. Germination is usually fairly quick.

Young leaves and stems - raw or cooked[46, 55, 61, 85, 105, 177]. Cooked and eaten as greens[257].