Siberian Pea Tree, Siberian peashrub
Caragana arborescens
Family: Fabaceae or Leguminosae
What it is like
C. arborescensis is a medium to fast growing perennial shrub. A species of legume. Leaves are alternate and compound with small leaflets and can be light to dark green. Small, yellow fragrant flowers bloom in early summer with pod fruits, containing many seeds, ripening in mid summer. Both the seed and seed pods are edible. Medicinal Uses include: Cancer; Emmenagogue. Other uses include: Dye; Fibre; Hedge; Oil; Shelterbelt; Soil stabilization; Hedge.
Caragana arborescens is a deciduous Shrub growing to 6 m (19ft) by 4 m (13ft) at a fast rate. See above for USDA hardiness. It is hardy to UK zone 2 and is not frost tender. It is in flower in May, and the seeds ripen in September. The species is hermaphrodite (has both male and female organs) and is pollinated by Bees. It can fix Nitrogen. It is noted for attracting wildlife. Suitable for: light (sandy) and medium (loamy) soils, prefers well-drained soil and can grow in nutritionally poor soil. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils and can grow in very alkaline soils. It cannot grow in the shade. It prefers dry or moist soil and can tolerate drought. The plant can tolerates strong winds but not maritime exposure.
Height (m): 6
Where it is found
River banks, pebbles, sands, open forests and forest edges, gully slopes and stony slopes.
E. Asia - Siberia to Mongolia. Occasionally naturalized in Europe in France.
Conservation Status:
Countries/locations it is found in
Asia, Australia, Canada, China, Kazakhstan, Mongolia, North America, Russia, Siberia*, Tasmania, USA,
How it is used
Food
Rating: 5
Seed - cooked. Small but produced in abundance, there are 4 - 6 seeds per pod. A bland flavour, it is best used in spicy dishes. The raw seed has a mild pea-like flavour, though we are not sure if it should be eaten in quantity when raw. The seed contains 12.4% of a fatty oil and up to 36% protein, it has been recommended as an emergency food for humans. More than just an emergency food, this species has the potential to become a staple crop in areas with continental climates. Young pods - cooked and used as a vegetable.
Oil: Oil
Seed: includes nuts, cereals, peas and beans.
Seedpod: things such as Okra, French and Runner beans.
Medicine
Rating: 1
The whole plant, known as ning tiao, is used in the treatment of cancer of the breast, and the orifice to the womb, and for dysmenorrhoea and other gynaecological problems.
Cancer: Used in the treatment of cancer.
Emmenagogue: Promotes or increases the menstrual flow. In early stages of pregnancy it can induce an abortion.
Other
Rating: 4
A fibre obtained from the bark is used for making cordage. A blue dye is obtained from the leaves. The seed contains 12.4% of a fatty oil. The plant can be grown as a hedge. It is quite wind-resistant and can also be planted in a shelterbelt. The plant has an extensive root system and can be used for erosion control, especially on marginal land. Because of its nitrogen-fixing capacity, it is valued as a soil-improving plant.
Companion: Companion planting is the careful placement of plants (especially vegetables and herbs) which have been shown to have beneficial effects on one another.
Dye: Plants that provide dyes.
Fibre: Used for making cloth, rope, paper etc.
Hedge: Plants that can be grown as hedges.
Oil: Vegetable oils have many uses, as lubricants, lighting, soap and paint making, waterproofing etc. This does not include the edible oils unless they are also mentioned as having other uses.
Shelterbelt: Wind resistant plants than can be grown to provide shelter in the garden etc.
Soil stabilization: Plants that can be grown in places such as sand dunes in order to prevent erosion by wind, water or other agents.
Agroforestry Services: Living fence: Simply managed rows of shrubs and trees.
Agroforestry Services: Nitrogen: Plants that contribute to nitrogen fixation include the legume family – Fabaceae.
Agroforestry Services: Windbreak: Linear plantings of trees and shrubs designed to enhance crop production, protect people and livestock and benefit soil and water conservation.
Industrial Crop: Biomass: Three broad categories: bamboos, resprouting woody plants, and giant grasses. uses include: protein, materials (paper, building materials, fibers, biochar etc.), chemicals (biobased chemicals), energy - biofuels
Management: Coppice: Cut to the ground repeatedly - resprouting vigorously. Non-destructive management systems maintaining the soil organic carbon.
Management: Standard: Plants grow to their standard height. Harvest fruit, seeds, or other products. Non-Destructive management systems.
Minor Global Crop: These crops are already grown or traded around the world, but on a smaller scale than the global perennial staple and industrial crops, The annual value of a minor global crop is under $1 billion US. Examples include shea, carob, Brazil nuts and fibers such as ramie and sisal.
Staple Crop: Protein: (16+ percent protein, 0-15 percent oil). Annuals include beans, chickpeas, lentils, cowpeas, and pigeon peas. Perennials include perennial beans, nuts, leaf protein concentrates, and edible milks.
Agroforestry Services: Living fence: Simply managed rows of shrubs and trees.
Agroforestry Services: Nitrogen: Plants that contribute to nitrogen fixation include the legume family – Fabaceae.
Agroforestry Services: Windbreak: Linear plantings of trees and shrubs designed to enhance crop production, protect people and livestock and benefit soil and water conservation.
Industrial Crop: Biomass: Three broad categories: bamboos, resprouting woody plants, and giant grasses. uses include: protein, materials (paper, building materials, fibers, biochar etc.), chemicals (biobased chemicals), energy - biofuels
Management: Coppice: Cut to the ground repeatedly - resprouting vigorously. Non-destructive management systems maintaining the soil organic carbon.
Management: Standard: Plants grow to their standard height. Harvest fruit, seeds, or other products. Non-Destructive management systems.
Minor Global Crop: These crops are already grown or traded around the world, but on a smaller scale than the global perennial staple and industrial crops, The annual value of a minor global crop is under $1 billion US. Examples include shea, carob, Brazil nuts and fibers such as ramie and sisal.
Staple Crop: Protein: (16+ percent protein, 0-15 percent oil). Annuals include beans, chickpeas, lentils, cowpeas, and pigeon peas. Perennials include perennial beans, nuts, leaf protein concentrates, and edible milks.
Attracts Wildlife: Plants noted for attracting wildlife
Carbon Farming: Plants that can be a critical part of the solution to climate problems. The Carbon Farming Solution - Eric Toensmeier.
Food Forest: Plants for Edible Forest Gardens and Food Forests.
Hedge: Hedge
Nitrogen Fixer: Plants that fix nitrogen in the soil
How it is grown
Succeeds in most well-drained soils, preferring full sun and a light sandy dry or well-drained soil. Tolerates very alkaline soils. Plants do not require a rich soil, succeeding on marginal land. Established plants are drought resistant. Fast growing. Dormant plants are hardy to about -30°c, they prefer a continental climate and do not grow so well in areas that do not have very cold winters. They grow and fruit very well in the eastern half of the country, even in northern areas, though they do not do so well in the wetter west. The young growth in spring, even on mature plants, is frost-tender and so it is best to grow the plants in a position sheltered from the early morning sun. The Siberian pea shrub has an excellent potential to become a staple food crop. The seed is nutritious and wholesome, although rather small it is often very freely borne and is easily harvested. This species has also been recommended as a nitrogen-fixing windbreak and ground cover plant that binds the soil and produces fibre and dye stuffs. C. boisii and C. fruticosa are closely related to this species and can probably be used similarly. A very ornamental plant, some named forms have been developed for their ornamental value. 'Nana' is a very compact dwarf form that grows slowly. 'Pendula' has stiffly pendent branches but is otherwise the same as the type species. A good bee plant. Plants in this genus are notably resistant to honey fungus. This species has a symbiotic relationship with certain soil bacteria, these bacteria form nodules on the roots and fix atmospheric nitrogen. Some of this nitrogen is utilized by the growing plant but some can also be used by other plants growing nearby. The plant is heat tolerant in zones 8 through 1. (Plant Hardiness Zones show how well plants withstand cold winter temperatures. Plant Heat Zones show when plants would start suffering from the heat. The Plant Heat Zone map is based on the number of "heat days" experienced in a given area where the temperature climbs to over 86 degrees F (30°C). At this temperature, many plants begin to suffer physiological damage. Heat Zones range from 1 (no heat days) to 12 (210 or more heat days). For example Heat Zone. 11-1 indicates that the plant is heat tolerant in zones 11 through 1.) For polyculture design as well as the above-ground architecture (form - tree, shrub etc. and size shown above) information on the habit and root pattern is also useful and given here if available. The plant growth habit is multistemmed with multiple stems from the crown.
Propagating it: Seed - best sown as soon as it is ripe in a cold frame. It usually germinates in 2 weeks. Stored seed should be pre-soaked for 24 hours in warm water then sown in a cold frame. If the seed has not swollen then scarify it and re-soak for another 12 hours before sowing. Germination usually takes place within 2 - 3 weeks at 20°c. Good percentage. As soon as they are large enough to handle, prick the seedlings out into individual pots and grow them on in a greenhouse for at least their first winter. Plant them out into their permanent positions in late spring or early summer, after the last expected frosts. There are approximately 40,000 seeds per kilo. Cuttings of half-ripe wood, 7 - 10cm with a heel, July/August in a frame. Layering in spring.
Best place to grow: Woodland Garden Sunny Edge; Hedge;
Habit: Shrub
Hardiness: 2-7
Growth: Fast
Soil: Light (sandy), medium
Shade: No shade
Moisture: Dry, moist
Things to keep in mind
Reports that this plant contains toxins have not been substantiated. The occurrence of cystine in the seeds is doubtful.
Its other names
Local names
Black karagana, Shu Jinjier, Tree Caragana,