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Green Manures and Cover Crops

Green manure cover crops (gmcc) are rapidly growing crops that cover and protect the soil. They are left on the soil surface as mulch or plowed under to enrich soil organic matter content. Legumes are prioritized for their ability to source atmospheric nitrogen through symbiosis with nitrogen-fixing bacteria. Gmcc can be established by seed, but some root at the nodes and can therefore be established from cuttings. ECHO does not provide legume inoculants. An ECHO Technical Note on “Green Manure Cover Crops” is available. Also see the GMCC Selection Tool.

  1. Sword Bean Canavalia gladiata

    Canavalia gladiata is a perennial, fast-growing, heavily producing, climbing legume. It is widely cultivated in the humid tropics of Southeast Asia, but remains a minor vegetable elsewhere. Plants can reach 10 m in length with a deep, penetrating root system. Leaves are trifoliate, similar to...

  2. Desmanthus Desmanthus virgatus

    Desmanthus is aperennial, nitrogen-fixing tropical shrub that can be used as a green manure/cover crop and as fodder for livestock. This shrub is adaptable to a range of environments and is tolerant of drought.

  3. Sesbania Sesbania rostrata

    Sesbania rostrata is an annual—or short-lived perennial—legume used as a green manure cover crop and fodder species for livestock. Growing to heights of 3 m, S. rostrata is one of the few legumes that produces nodulated stem tissues for further colonization by nitrogen-fixing bacteria. Leaves of...

  4. American Joint Vetch Aeschynomene americana

    Aeschynomene americana is an annual legume forage crop and green manure cover crop. Considered a “subshrub,” A. americana can reach heights of 1-2 m. Pinnately compound leaves are finely textured, with 25-60 leaflets per leaf. Borne on pubescent stems, leaves reach 7.5 cm in length. Flowers...

  5. Tarwi Lupinus mutabilis

    Tarwi is an erect, annual, cool-seasonnitrogen-fixing plant that grows up to 2.5 m in height. For human consumption, the seeds must be soaked in water for several days to remove bitter alkaloids. The seeds are high in protein, pressed for oil, and fed to livestock. Tarwi is a good green manure or...

  6. Cereal Rye Secale cereale

    Secale cereale is an upright, annual, cool season, grain-bearing grass. A tufted grass with hollow stems, S. cereale reaches heights of 2 m. The blue-green leaves are borne on tillers, supported by extensive root systems that extend up to 2 m in the soil. Spike flowers give way to heads of pale...

  7. Pigeon Pea Cajanus cajan

    Pigeon pea is a nitrogen-fixing, perennial shrub, growing to 4 m in height, that produces green or dry seed in seasonally dry climates. Pigeon peas are adaptable to many soil types and are used as a dry pea, green vegetable, fodder, fuelwood, green manure or cover crop.

  8. Bambara Groundnut Vigna subterranea

    Vigna subterranea is an annual, herbaceousnitrogen-fixing legume of particular importance throughout semi-arid Africa. Leaves are trifoliate and are borne along creeping stems that extend along the ground surface. Flowers are yellow and butterfly-shaped, similar to other legumes. Upon...

  9. Jicama Pachyrhizus erosus

    Jicama is a perennialnitrogen-fixing vine thatreaches10 m in lengthand is grown for the edible tuber. Jicama is also used as fodder, green manure, or cover crop.The tuber is edible and is mainly a starch/carbohydrate source, relatively low in calories. The leaves and mature beans contain...

  10. Beach Bean Canavalia rosea (formerly maritima)

    Canavalia rosea is a leguminous, drought, and salt tolerant vine adapted to growing under very dry and hot conditions. Vines are widely distributed on beaches and dunes in the tropics and subtropics, as well as in western and northern Australia. They can reach lengths of 6 m, with a compact...

  11. Fish Bean Tephrosia vogelii

    Fish bean is a short-lived perennial, semi-woodynitrogen-fixing plant that growsup to 3 m in height. Itis used for green manure, erosion control, and mulch. It is known to contain rotenoids and can be used as an insecticide and fish poison. Fish bean should NOT be used as fodder for animals.

  12. Glycine Neonotonia wightii

    Glycine is a perennial, vining, nitrogen-fixing, green manure or cover crop that may be grown to suppress weed growth, improve the soil nitrogen supply, and slow soil erosion. It is also a forage crop that can be grown in pure stands for hay or in a mixed pasture system.

  13. Agati Sesbania grandiflora

    Sesbania grandiflora is a small, fast-growing, nitrogen-fixing tree, that can grow to 10 m height in 3-4 years. This plant is grown mainly as a green manure or cover crop but can also be used as forage for livestock.

  14. Horse Gram Macrotyloma uniflorum

    Horse gram is a dense, low-growing, nitrogen-fixing, annual crop grown for forage and human consumption. It is usually sown as an intercrop but can also be used as a green manure or cover crop. It will tolerate drought conditions, poor soil, and some salinity.

  15. Grass Pea Lathyrus sativus

    Grass pea is an annual, vining or climbing, drought-tolerantnitrogen-fixing plantup to 1 m in height. It is adapted to cooler temperaturesand higher altitudes in the tropics.Grass peas are an excellent leguminous crop for dry and poor soils. They are very drought tolerant, growing when other...

  16. Sesbania sesban Sesbania sesban

    Sesbania is a fast-growing, nitrogen-fixing perennial, growing to 7 m in height. It is typically found in wet locations and can withstand water logging and flooded conditions. Sesbania is used as a cover crop or green manure, coppices readily, provides light fuelwood, and good forage for...

  17. Forage Peanut Arachis pintoi

    Forage Peanut is a prostate, nitrogen-fixing, perennial plant, used mostly as a cover crop for erosion, weed, and fire control. It is favored for these purposes in tree plantations, as it will tolerate some shade. It also makes for good cattle and poultry grazing if a 30-day rest period is...

  18. Adzuki Bean Vigna angularis

    Adzuki bean is a bushingor vining, nitrogen-fixingannual plant that is moderately drought tolerant. This bean grows best in temperate climates or higher altitudes in the tropics. The young pods, fresh seeds, and dry beans are used for human consumption.

  19. Calliandra Calliandra calothyrsus

    Calliandra is a vigorous, nitrogen-fixing, bushy tree that can be fast-growing on poor soils. The tree responds well to coppicing, is a good fuelwood source and the leaves provide excellent fodder. Calliandra is used to enrich soil and provide stability on steep slopes.

  20. Hairy Indigo Indigofera hirsuta

    Hairy indigo is a reseeding annual, nitrogen-fixing, erect, bushy plant, up to 2.5 m in height. It is used as a forage, summer fallow, green manure, or cover crop.

  21. Cowpea Vigna unguiculata subsp. unguiculata

    Vigna unguiculata is a grain legume that originates in Africa. Attributes such as vine shape (climbing, prostrate, or semi-erect), seed color (shades of white, pink, brown, and black), and seed maturation time (60 to 240 days) vary with variety. Pods appear in V-shaped pairs.It is an important...

  22. Bush Velvet Bean Mucuna pruriens

    Bush forms of Mucuna pruriens grow rapidly, but have a more compact growth habit than vining types. The leaves are large and trifoliate with lateral leaflets 7–15 cm long, 5–12 cm wide. Flowers are light purple or white, resulting in pods 4-13 cm in length. Wild forms of M. pruriens have pods...

  23. Velvet Bean Mucuna pruriens

    Velvet bean is a vigorous, nitrogen-fixing, bushy or vining, annual plant. The vines will climb anything available and can reach 10 m or more in length. Velvet bean is somewhat drought tolerant and is an excellent green manure or cover crop with ability to suppress weeds and provide generous...

  24. Runner Bean Phaseolus coccineus

    Phaseolus coccineus is a perennialvining legume from the highlands of Central America. Due to its showy red flowers, P. coccineus is often grown as an ornamental, though nearly all parts of the plant are ediblegiven the appropriate preparations. A climbing vine, P. coccineus reaches heights of...

  25. Mexican Sunflower Tithonia diversifolia

    Mexican sunflower is a woody perennialwith showy yellow flowers growing to 3 m in height. It can be used as an ornamental, a hedge, a compost ingredient, a fodder, a green manure, and a soil erosion control. Mexican sunflower is known to be efficient in extracting phosphorus from the soil. Green...

  26. Fava Bean Vicia faba

    Vicia faba is an annual herbaceous plant in the legume family, usually considered to contain three subspecies: V. faba subsp. major (broad bean), V. faba subsp.equina (horse bean), and V. faba subsp. minor (tick bean or pigeon bean). Plants are upright, reaching heights of 1.5-2 m. Leaves of V....

  27. Hairy Vetch Vicia villosa

    Native to Europe or western Asia, Vicia villosa is suited to cooler climates. It is a viny legume with longsoft hairs on the stems and leaves. Branchingstems/vines are prostrate (30-70 cm), but can climb (up to 1-2 m) the stalks of any neighboring plants. Stems support long hanging groups of...

  28. Prickly Sesban Sesbania bispinosa

    Prickly sesban is a fast-growing, annual, nitrogen-fixing shrub, growing up to 2 m in one season. It is valuable for soil improvement, erosion control, firewood, forage, fiber, and as a green manure/cover crop.

  29. Slender Leaf Rattlebox Crotalaria ochroleuca

    Crotalaria ochroleuca is an annual herbaceous plant utilized for fiber, forage, and as a green manure cover crop. Reaching heights of 2.5 m, C. ochroleuca bears long, slender, trifoliate leaves and five-petalous blooms (banner, wing, and keel) similar to other legumes. Short-day flowering.

  30. Flemingia Flemingia macrophylla

    Flemingia macrophylla is a perennial, deep-rooted, woody, nitrogen-fixing shrub up to 2.5 m in height. It is useful for shade, and for soil conservation and improvement as an alley crop, green manure, or cover crop.

  31. Siratro Macroptilium atropurpureum

    The exact origin of this crop is not known but it is commonly grown from southern Texas south to Peru. It was named “Siratro” and first hybridized in the early 1960’s.

  32. White Lupine Lupinus albus

    White lupine is a cool season, nitrogen-fixing, bushyannual plant that grows up to 1.6 m in height and is adapted to higher altitudes in the tropics. It is mainly used for forage, green manure, or cover crops, but non-toxic modern varieties have been developed for human consumption. The beans are...

  33. Tropical Kudzu Pueraria phaseoloides

    Tropical kudzu is a perennial, vigorous, deep-rooted, vining or climbingnitrogen-fixing plantwith vines up to 10 m long. This crop tolerates high water levels (even occasional water logging), grows well in the dry season, and can tolerate acidic soils and shade. It is used as a forage, green...

  34. Sunn Hemp Crotalaria juncea

    Crotalaria juncea is an annual herbaceaous plant utilized for fiber, forage, and as a green manure cover crop. Reaching heights of 3.5 m, C. juncea bears long, slender, trifoliate leaves and typical, butterfly-shaped blooms similar to other legumes.

  35. Jack Bean Canavalia ensiformis

    Canavalia ensiformis is native to the West Indies and Central America. It closely resembles Sword Bean, C. gladiata, and the predominantly African wild species, C. virosa. C. ensiformis is widely distributed in the tropics and subtropics although it is regarded as a minor vegetable rather than a...

  36. Butterfly Pea Clitoria ternatea

    Clitoria ternatea is a climbing, vining, tropical legume. Leaves are pinnately compound, each bearing 5-7 leaflets. Flowers occur in singles or pairs, are 4 cm wide, and are colored deep blue or solid white. These give way to pubescent, flat pods, that, upon maturation, dehisce (split and burst...

  37. Rice Bean Vigna umbellata

    Vigna umbellata is a nitrogen-fixing perennial legumeoften grown as an annual. Depending on the variety, V. umbellata presents as vining, bush, or semi-erect forms, reaching heights of 30-200 cm. Produces 7.5-12.5 cm long pods. V. umbellata seeds vary in color from green-yellow to red to black. A...

  38. Lablab Lablab purpureus

    Lablab purpureus is bean capable of growing in a wide range of climatic conditions and soil types,depending upon the variety chosen. It is widely cultivated throughout the tropics and subtropics and occurs wild in tropical Africa (including Madagascar) and India. The palatability of lablab...

  39. Mung Bean Vigna radiata

    Vigna radiata is an annual, erect or semi-erect legume, reaching heights up to 1.25 m. V. radiata produces 4-30 yellow or green flowers per cluster that become pubescent pods. Leaves are alternate and trifoliate.