Trifolium incarnatum, known as crimson clover[1] or Italian clover, is a species of herbaceous flowering plant in the family Fabaceae, native to most of Europe. It has been introduced to other areas, including the United States and Japan.

Crimson clover is commonly used in agriculture as a nitrogen-fixing cover crop.[2] The plant uses associations with Rhizobia bacteria to fix nitrogen.[2] The plant is widely grown as a protein-rich forage crop for cattle and other livestock, and is suitable to be made into hay. It is commonly grazed by domestic and wild ruminants.[3] It is often used for roadside erosion control, as well as beautification, however it tends to eliminate all other desirable spring and early-summer species of native vegetation in the area where it is planted.


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Crimson clover's flowers and the sprouts are edible and similar in taste and appearance to alfalfa sprouts.[4][5] They can be added as an ingredient in salads, sandwiches, and other dishes, made into tisanes, and can be dried and ground into flour.[5] 100 grams of crimson clover sprouts contains 23 calories, 4g of protein, 2g of fiber, and provides 38 percent of the RDI of vitamin K, as well as 14 percent of the RDI of vitamin C.[4] It has extremely small amounts of calcium, iron, phosphorus, zinc, selenium and magnesium.[4] Like all sprouts eaten raw, there is a risk of contamination with Escherichia coli, Salmonella, Listeria, and Bacillus cereus.[6] However, many reputable facilities in the United States attempt to regulate and test these crops for such bacteria.[7]

In mild winter areas, such as coastal California and the Pacific Northwest, crimson clover typically behaves as a winter annual. The seeds germinate in the first rains of late summer or autumn. The plants grow through the winter, and have a major flush of bloom in late spring. In dry summer climates, the plants die after maturing seeds. In sites having sufficient summer moisture, plants can continue growth and flowering; and may even behave as short lived perennials.

When using crimson clover to improve very poor soil, mixing a balanced organic fertilizer into the soil before planting will give better results. Using inoculated seed can also help to grow a vigorous stand.

Sow in late summer so that plants can become established before cold weather comes. In cold climates, crimson clover can be planted in early spring instead of fall. Broadcast seed into cultivated soil so that the seeds are about 2 inches (5 cm) apart and one-half inch (1 cm) deep. No thinning is required.

Our Garden Planner can produce a personalized calendar of when to sow, plant and harvest for your area.

Crimson clover (Trifolium incarnatum) is a relatively new cover crop for Michigan. Traditionally used further south, MSU researchers and southern Michigan farmers have used this annual clover effectively as a cover crop in corn, soybeans and wheat. Crimson clover has taller flower stems, grows more quickly and has larger seeds than the more commonly used red clover.

With its rapid, robust growth, crimson clover provides early spring nitrogen for full-season crops. Rapid fall growth, or summer growth in cool areas, also makes it a top choice for short-rotation niches as a weed suppressing green manure. Popular as a staple forage and roadside cover crop throughout the Southeast, crimson clover is gaining increased recognition as a versatile summer-annual cover in colder regions. Its spectacular beauty when flowering keeps it visible even in a mix with other flowering legumes, a common use in California nut groves and orchards. In Michigan, it is used successfully between rows of blueberries.

Reseeding cultivars provide natural fertility to corn and cotton. Crimson clover works especially well before grain sorghum, which is planted later than corn. It is being tested extensively in no-till and zone-till systems. One goal is to let the legume reseed yearly for no-cost, season-long erosion control, weed suppression and nitrogen banking for the next year.

Crimson clover is gaining popularity as a winter-killed annual, like oats, in Zones 5 and colder. Planted in late summer, it provides good groundcover and weed control as it fixes nitrogen from the atmosphere and scavenges nitrogen from the soil. Its winterkilled residue is easy to manage in spring.

Biomass. As a winter annual, crimson clover can produce 3,500 to 5,500 lb. dry matter/A and fix 70 to 150 lb. N/A by mid-May in Zone 8 (the inland Deep South). In a Mississippi study, crimson clover had produced mature seed by April 21, as well as 5,500 lb. DM and 135 lb. N/A. The study concluded that crimson clover is one of several winter annual legumes that can provide adequate but not excessive amounts of N for southern grain sorghum production (22, 36, 105). Crimson clover has produced more than 7,000 lb. DM/A several times at a USDA-ARS site in Beltsville, MD., where it produced 180 lb. N and 7,800 lb. DM/A in 1996 (412).

In field trials of six annual legumes in Mississippi, crimson clover was found to produce the most dry matter (5,600 to 6,000 lb./A) compared to hairy vetch, bigflower vetch, berseem clover, arrowleaf clover (Trifolium vesiculosum) and winter peas. It produced 99 to 130 lb. N/A and is recommended for soil erosion control because of its high early-autumn dry matter production (426).

Mixtures. Crimson clover grows well in mixtures with small grains, grasses and other clovers. An oats crop is a frequent companion, either as a nurse crop to establish a clear stand of crimson clover, or as a high-biomass, nutrient-scavenging partner. In California, crimson clover is planted with rose clover and medics in orchards and nut groves to minimize erosion and provide some N to tree crops (422).

Beneficial habitat and nectar source. Crimson clover has showy, deep red blossoms 1/2 to 1 inch long. They produce abundant nectar, and are visited frequently by various types of bees. The blooms may contain many minute pirate bugs, an important beneficial insect that preys on many small pests, especially thrips (422). In Michigan, crimson increased blueberry pollination when planted in row middles. Georgia research shows that crimson clover sustains populations of pea aphids and blue alfalfa aphids. These species are not pests of pecans, but provide alternative food for beneficial predators such as lady beetles, which later attack pecan aphids.

Nutrient cycler. Crimson clover adds to the soil organic N pool by scavenging mineralized N and by normal legume N fixation. The scavenging process, accomplished most effectively by grasses, helps reduce the potential for N leaching into groundwater during winter and spring (181, 265). Mixed with annual ryegrass in a simulated rainfall study, crimson clover reduced runoff from the herbicide lactofen by 94 percent and norflurazon and fluometuron by 100 percent (346). The grass/legume mixture combines fibrous surface roots with short tap roots.

Crimson clover will grow well in about any type of well drained soil, especially sandy loam. It may fare poorly on heavy clay, waterlogged, extremely acid or alkaline soils. Once established, it thrives in cool, moist conditions. Dry soil often hinders fall plantings in the South.

While October plantings are possible in the lower Mississippi Delta, an August 15 planting in a northern Mississippi test led to higher yields than later dates (228). In the lower Coastal Plain of the Gulf South, crimson clover can be planted until mid-November.

Summer annual use. In general, plant as soon as all danger of frost is past. Spring sowing establishes crimson clover for a rotation with potatoes in Maine. In Michigan, researchers have successfully established crimson clover after short-season crops such as snap beans (229, 270).

In Northern corn fields, Michigan studies showed that crimson clover can be overseeded at final cultivation (layby) when corn is 16 to 24 inches tall. Crimson clover was overseeded at 15 lb./A in 20-inch bands between 30-inch rows using insecticide boxes and an air seeder. The clover established well and caused no corn yield loss (295).Crimson clover has proved to be more promising in this niche than black medic, red clover or annual ryegrass, averaging 1,500 lb. DM/A and more than 50 lb. N/A (270).

Researchers have successfully strip-tilled into standing crimson clover when 25 to 80 percent of the row width is desiccated with a herbicide or mechanically tilled for the planting area. Narrower strips of crimson clover increased weed pressure but reduced moisture competition, while wider strips favored reseeding of the cover (236).

In a crimson clover-before-corn system, growers can optimize grain yields by no-tilling into the crimson clover and leaving the residue on the surface, or optimize total forage yield by harvesting the crimson clover immediately before planting corn for grain or silage (204). In Mississippi, sweet potatoes and peanuts suffered no yield or quality penalty when they were no-tilled into killed crimson clover. The system reduced soil erosion and decreased weed competition (35).

In Ohio, crimson clover mixed with hairy vetch, rye and barley provided a fertility enhancing mulch for no-till processing tomato transplants. Use of a prototype undercutter implement with a rolling harrow provided a good kill. Because the wide blades cut just under the soil surface on raised beds, they do not break stalks, thus lengthening residue durability. The long-lasting residue gave excellent results, even under organic management without the herbicides, insecticides or fungicides used on parallel plots under different management regimes. Nancy Creamer at the University of North Carolina is continuing work on the undercutter and on cover crops in organic vegetable systems (96).

Mixed seeding. For cover crop mixtures, sow crimson clover at about two-thirds of its normal rate and the other crop at one third to one-half of its monoculture rate. Crimson clover development is similar to tall fescue. It even can be established with light incorporation in existing stands of aggressive grasses after they have been closely mowed or grazed. ff782bc1db

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