Lactuca perennis
| Lactuca perennis | |
| Light: |  |
| Moisture: |   |
| Hardiness: | 6 |
| Soil pH: | 5.6-8.4 |
| Self Pollinated | |
| Height: | 2' |
| Width: | 1' |
| Blooms: | Early Summer-Late Summer |
| Native to: | |
| Edible Rating: |  |
| Medicinal Rating: |  |
| Tea: | Yes |
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Lactuca perennis (common name: perennial lettuce)
Propagation: Seed - sow April in a greenhouse, only just covering the seed. Germination is usually fairly quick When they are large enough to handle, prick the seedlings out into individual pots and grow them on in the greenhouse for their first winter. Plant them out into their permanent positions in late spring or early summer, after the last expected frosts.
Division in spring. It is best to pot up the divisions and keep them in a lightly shaded position in a cold frame until they are growing away well. Plant them out in the summer.
Root cuttings in spring[K].
Cultivation: Prefers a light well-drained sandy loam and a sunny position[1].
Plants are hardy to about -25°c[1].
Range: S. Europe.
Habitat: Rocky or other dry places, especially on calcareous soils[2][3].
Edibility: Leaves - raw or cooked[2][4][5][6][7]. The leaves are often blanched to reduce any bitterness. They are fairly acceptable raw in salads (even without being blanched), especially in late winter and spring when the flavour is quite mild[K]. The leaves do become much more bitter in the summer, however, especially as the plant comes into flower[K].
Medicinal: Although we have seen no specific reports for this species, most if not all members of the genus have a milky sap that contains the substance 'lactucarium' and can probably be used as the report below details[K].
The whole plant is rich in a milky sap that flows freely from any wounds. This hardens and dries when in contact with the air[8]. The sap contains 'lactucarium', which is used in medicine for its anodyne, antispasmodic, digestive, diuretic, hypnotic, narcotic and sedative properties[9][10][4][11][12][13][14]. Lactucarium has the effects of a feeble opium, but without its tendency to cause digestive upsets[8], nor is it addictive[15]. It is taken internally in the treatment of insomnia, anxiety, neuroses, hyperactivity in children, dry coughs, whooping cough, rheumatic pain etc[14]. Concentrations of lactucarium are low in young plants and most concentrated when the plant comes into flower[14]. 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[8]. 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[14] and overdoses can cause death through cardiac paralysis[15][9].
Some physicians believe that any effects of this medicine are caused by the mind of the patient rather than by the medicine[13].
The sap has also been applied externally in the treatment of warts[16].
Pollinators: Insects
Soil: Can grow in light and medium soils.
Drainage: Prefers well drained soil.
Seed Ripens: Mid Summer-Early Fall
Flower Type: Hermaphrodite
Known Hazards: 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 fo
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References
- ↑ 1.0 1.1 Phillips, Roger and Martyn Rix. Perennials - The Definitve Reference. Pan Books, 1991.
- ↑ 2.0 2.1 Vilmorin-Andrieux. The Vegetable Garden. Ten Speed Press.
- ↑ Tutin, Tom et al.. Flora Europaea. Cambridge University Press, 1964.
- ↑ 4.0 4.1 Uphof, Johannes. Dictionary of Economic Plants. Weinheim, 1959.
- ↑ Usher, George. A Dictionary of Plants Used by Man. Constable, 1974.
- ↑ Tanaka, Tyōzaburō. Tanaka's Cyclopaedia of Edible Plants of the World. Keigaku Publishing, 1976.
- ↑ Facciola, Stephen. Cornucopia - A Source Book of Edible Plants. Kampong Publications, 1990.
- ↑ 8.0 8.1 8.2 Grieve, Margaret. A Modern Herbal. Penguin, 1984.
- ↑ 9.0 9.1 9.2 Launert, Edmund. Edible and Medicinal Plants. Hamlyn, 1981.
- ↑ Lust, John. The Herb Book. Bantam Books, 1983.
- ↑ Mills, Simon. The Dictionary of Modern Herbalism.
- ↑ Emboden, William. Narcotic Plants. Studio Vista, 1979.
- ↑ 13.0 13.1 Weiner, Michael. Earth Medicine, Earth Food. Ballantine Books, 1980.
- ↑ 14.0 14.1 14.2 14.3 Bown, Deni. Royal Horticultural Society Encyclopaedia of Herbs and Their Uses. Dorling Kindersley, 1995.
- ↑ 15.0 15.1 Chiej, Roberto. Encyclopaedia of Medicinal Plants. MacDonald, 1984.
- ↑ Foster, Steven and Billy Tatum. Medicinal Plants of Eastern and Central North America. Houghton Mifflin, 1990.