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Botanical Name : Robinia pseudoacacia
Species: R. pseudoacacia
Common Name : Black Locust, Yellow Locust
Habitat : Robinia pseudoacacia is native to the southeastern United States, but has been widely planted and naturalized elsewhere in temperate North America, Europe, Southern Africa and Asia and is considered an invasive species in some areas. A less frequently used common name is False Acacia, which is a literal translation of the specific epithet. It was introduced into Britain in 1636.It grows in woods and thickets, especially in deep well-drained calcareous soils.
A decidious Tree growing to 25m by 15m at a fast rate.With a trunk up to 0.8 m diameter (exceptionally up to 52 m tall and 1.6 m diameter in very old trees), with thick, deeply furrowed blackish bark. The leaves are 10–25 cm long, pinnate with 9–19 oval leaflets, 2–5 cm long and 1.5–3 cm broad. Each leaf usually has a pair of short thorns at the base, 1–2 mm long or absent on adult crown shoots, up to 2 cm long on vigorous young plants. The intensely fragrant (reminiscent of orange blossoms) flowers are white, borne in pendulous racemes 8–20 cm long, and are considered edible (dipped in batter; deep-fried). The fruit is a legume 5–10 cm long, containing 4–10 seeds
It is hardy to zone 3. It is in flower in June, and the seeds ripen from November to March. The flowers are hermaphrodite (have both male and female organs) and are pollinated by Bees. It can fix Nitrogen. It is noted for attracting wildlife.
The plant prefers light (sandy), medium (loamy) and heavy (clay) soils, requires well-drained soil and can grow in nutritionally poor soil. The plant prefers acid, neutral and basic (alkaline) soils. It cannot grow in the shade. It requires dry or moist soil and can tolerate drought. It can tolerate atmospheric pollution.
Cultivation : Succeeds in any well-drained soil, preferring one that is not too rich. Succeeds in dry barren sites, tolerating drought and atmospheric pollution[60, 200]. Succeeds in a hot dry position. The plant is reported to tolerate an annual precipitation in the range of 61 to 191cm, an annual temperature in the range of 7.6 to 20.3°C and a pH of 6.0 to 7.0. A fast-growing tree for the first 30 years of its life, it can begin to flower when only 6 years old, though 10 – 12 years is more normal. The flowers are a rich source of nectar and are very fragrant with a vanilla-like scent. The branches are brittle and very liable to wind damage. When plants are grown in rich soils they produce coarse and rank growth which is even more liable to wind damage. The plants sucker freely and often form dense thickets, the suckers have vicious thorns. There are some named varieties selected for their ornamental value, some of these are thornless. Any pruning should be done in late summer in order to reduce the risk of bleeding. The leaves are rich in tannin and other substances which inhibit the growth of other plants. A very greedy tree, tending to impoverish the soil. (Although a legume, I believe it does not fix atmospheric nitrogen) A very good bee plant . This species is notably resistant to honey fungus.
Propagation : Seed – pre-soak for 48 hours in warm water and sow the seed in late winter in a cold frame. A short stratification improves germination rates and time. Prick out the seedlings into individual pots when they are large enough to handle and grow them on in the greenhouse for their first winter. Plant them out into their permanent positions in the following summer. Other reports say that the seed can be sown in an outdoor seedbed in spring. The seed stores for over 10 years. Suckers taken during the dormant season.
Edible Parts: Flowers; Seed; Seedpod.
Edible Uses: Condiment; Drink; Oil.
Seed – cooked. Oily. They are boiled and used like peas. After boiling the seeds lose their acid taste. The seed is about 4mm long and is produced in pods up to 10cm long that contain 4 – 8 seeds. A nutritional analysis is available. Young seedpods – cooked. The pods contain a sweetish pulp that is safe to eat and is relished by small children. (This report is quite probably mistaken, having been confused with the honey locust, Gleditsia spp.) A strong, narcotic and intoxicating drink is made from the skin of the fruit. Piperonal is extracted from the plant, it is used as a vanilla substitute. No further details. All the above entries should be treated with some caution, see the notes at the top of the page regarding toxicity. Flowers – cooked. A fragrant aroma, they are used in making jams and pancakes. They can also be made into a pleasant drink
Figures in grams (g) or miligrams (mg) per 100g of food.
*Seed (Dry weight) : 0 Calories per 100g
*Protein: 21g; Fat: 3g; Carbohydrate: 0g; Fibre: 28g; Ash: 6.8g;
*Minerals – Calcium: 1400mg; Phosphorus: 0.3mg; Iron: 0mg; Magnesium: 0mg; Sodium: 0mg; Potassium: 0mg; Zinc: 0mg;
*Vitamins – A: 0mg; Thiamine (B1): 0mg; Riboflavin (B2): 0mg; Niacin: 0mg; B6: 0mg; C: 0mg;
Febrifuge. The flowers are antispasmodic, aromatic, diuretic, emollient and laxative. They are cooked and eaten for the treatment of eye ailments. The flower is said to contain the antitumor compound benzoaldehyde. The inner bark and the root bark are emetic, purgative and tonic. The root bark has been chewed to induce vomiting, or held in the mouth to allay toothache, though it is rarely if ever prescribed as a therapeutic agent in Britain. The fruit is narcotic. This probably refers to the seedpod. The leaves are cholagogue and emetic. The leaf juice inhibits viruses
Dye; Essential; Fibre; Fuel; Soil stabilization; Wood.
A drying oil is obtained from the seed. An essential oil is obtained from the flowers. Highly valued, it is used in perfumery. A yellow dye is obtained from the bark. Robinetin is a strong dyestuff yielding with different mordants different shades similar to those obtained with fisetin, quercetin, and myricetin; with aluminum mordant, it dyes cotton to a brown-orange shade. The bark contains tannin, but not in sufficient quantity for utilization. On a 10% moisture basis, the bark contains 7.2% tannin and the heartwood of young trees 5.7%. The bark is used to make paper and is a substitute for silk and wool. Trees sucker freely, especially if coppiced, and they can be used for stabilizing banks etc. Wood – close-grained, exceedingly hard, heavy, very strong, resists shock and is very durable in contact with the soil. It weighs 45lb per cubic foot and is used in shipbuilding and for making fence posts, treenails, floors etc. A very good fuel, but it should be used with caution because it flares up and projects sparks. The wood of Robinia pseudoacacia var. rectissima, the so called ‘Long Island‘ or ‘Shipmast’ locust, has a greater resistance to decay and wood borers, outlasting other locust posts and stakes by 50 – 100%.
The flowers are very fragrant with a vanilla-like scent
Known Hazards: All parts of the plant (except the flowers) and especially the bark, should be considered to be toxic. The toxins are destroyed by heat
Disclaimer : The information presented herein is intended for educational purposes only. Individual results may vary, and before using any supplements, it is always advisable to consult with your own health care provider.
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