Trefoil (Trifolium) occurs as genus of about 300 species of plants in the pea family Fabaceae. It is encountered primarily around northern moderate regions, however likewise, such as several more northward moderate genera, on the mountains in the tropics. A plants come little annual or even even even even perennial herbs using trifoliated (seldom Five- or 7-foliate) leaves, using stipules adnate to a leaf-petiole, & heads or heavy spikes of little red, purple, white, or seldom yellow flowers; the little, couple-seeded pods come enclosed in the calyx. Eighteen mintage come indigene around Britain, and many come extensively cultivated when fodder-plants. A virtually all widely cultivated trefoil come White clover Trifolium repens and Red clover Trifolium pratense.

More closely related genera typically known as trefoil include Melilotus (sweet clover) and Medicago (alfalfa or 'calvary clover').

A scientific title derives from either a Latin tres, three, & folium, a leaf, therefore known as from either the characteristic form of the leaf, which has terzetto leaflets (trifoliate), hence a popular title trefoil. Trefoil come utilized when food plants per larvae of some Lepidoptera species including Latticed Heath, Garden Dart and Heart and Club.

The most common idiom is "to be in clover", meaning to exist as dwelling the carefree life of ease, comfort, or even prosperity.

Cultivation
Trefoil, either sown alone or even inside mixture sustaining rye-rye grass, has for an extended period formed the staple crop for dirtying, for many reasons: it grows freely, shooting higher once more fallowing recurrent mowings; it produces an abundant crop; these are toothsome to & nourishing for livestock; it grows in a great range of soils and climates; and these are appropriate either for even pasturage or dirtying. Except in certain rich chalky clay soils, it has okay,, nonetheless, be an extremely precarious crop. A seed germinates once freely when ever, when these are echt, however this is alas uncommon. Within numerous areas, farmers are sorting through that a trefoil has either completely disappeared by mid spring, or even is observed single within capricious patches on text & there on top a field. There is no acceptable explanation of this "clover-sickness" has however been given, nor has any certain guide been found. But, 1 crucial fact is okay, swell established; after crop rotations come managed thus that trefoil doesn't recur at shorter intervals than eight years, it grows sustaining tremendously of its pristine vigour. A noesis of this fact okay, determines several farmers around varying their rotation thus when to locate this crucial prevent. At in one case there was a somewhat rife belief that a introduction of beans into a rotation experienced a specific influence of a beneficial sort on the trefoil whilst it come next to exist as sown; however verity explanation seems to become that the beans work favorably simply per incident circumstance of well-nigh necessarily lengthening the interval between the return of trefoil.

Trefoil infection can be linked to pollinator decline. Beekeepers are typically around heavily require from either farmers by using trefoil pastures, world health organizatiin need bees set on their farms, when farmers watch a increased reseeding that occurs by owning increased bee activity.

Species

T. incarnatum, Deep red or even Italian clover, though non healthy sufficiency to withstand a climate of Scotland witharound ordinary winters, occurs as virtually all valuable forage crop in England. These are sown when quickly when imaginable when a removal of a grain crop at the rate of 20-22 kg/ha. These are obtained to succeed better after exclusively the surface of the soil is stirred per scarifier & harrow than while a plowing i1 given. It grows quickly inside spring, & yields an abundant crop of green food, peculiarly toothsome to survive commodity. These are as well suitable for making into hay. Just 1 cutting, but, may be found, when it doesn't shoot once more fallowing existence mown.

T. repens, White or even Dutch clover, occurs as perennial abundant around hayfield & proficient pastures. A flowers come whiten or even pink, becoming black & deflexed when a corolla fades. T. hybridum, Alsike or even Swedish trefoil, occurs as perennial which was introduced early around the 19th century & has okay, be naturalized in Britain. A flowers come whiten or even rosy, & resemble people of the survive mintage. T. medium, hayfield or even zag trefoil, the perennial by having straggling flexuous stems & rose-rosy-purple flowers, is of little farming value. More British mintage come: T. arvense, Hare's-foot trefoil; incurred within fields & prohibitionist pastures, the easy hirsute plant by owning microscopic white or even blench pink flowers & feathery sepals; T. fragiferum, Strawberry trefoil, by having denselyflowered, orbicular, rose-rosy-purple heads & swollen calyxes; T. procumbens, Hop trefoil, in dry pastures & wayside, a heads of straw flowers suggesting miniature hops; & a somewhat similar T. minus, green inside pastures & wayside, by owning little heads & little yellow flowers turning dark light brown. A survive known as is typically known as Shamrock. Specimens of shamrock & more trefoil come non infrequently noticed by owning quaternary leaflets, &, rather more rarities, are considered lucky.

Uses
Trefoil come the worthful survival food, when it is high around protein, widespread, & abundant. It is non convenient to weaken birthday suit, however this may be well fixed by boiling for Five-10 transactions. Dried flowerheads & pod can too exist as ground higher into the alimentary flour & mixed using more nutrients. Dried flowerheads besides steeped within hot the water system for a sound, tasty tea.