Thistles can be institute growing in many location – lawns , garden bed , along the wayside , and in pastures and fields . Thistles can be identified by the shape of their leaves , their color , their spines and the colour of their flowers . There are five common thistles : bull thistle , musk thistle , Scotch thistle , female thistle and Canada thistle .

Bull Thistle

Bull thistle , also love as Cirsium vulgare , is a biyearly thistle . The leave of absence are one of its primary substance of identification . Bull thistle has dark green leaves with bass lobes ; the upper side of the leaf have coarse whisker , while the undersurface has soft livid hairs . The tip of each of the lobes of the Taurus thistle has a long , yellow spine . The flowers are reddish - purpleness in colour , and they appear in the month of June through July . Bull thistle reaches a height of from 2 to 6 invertebrate foot .

Musk Thistle

Musk thistle ( Carduus nutans ) is a 3- to 8 - fundament biennial thistle . A major identifiable feature of musk thistle is that the out edge of the leaf is silvery in people of colour , while the inside of the leaf is light unripe . You will also recover 1/8- to 3/8 - column inch spines on the wind of the leaves . This thistle is devoid of foliage hairs . The bloom , which appear in May through June , are quite large ( 2 to 3 inch in diam ) , purpleness / lavender in colouring , and round in build .

Scotch Thistle

Scotch thistle can grow to a height of from 3 to 9 foot . It is also get laid as Onopordum acanthium and can be either and yearly or a biyearly plant life . The leaves are long and large ( up to 18 in in length ) , and they are bluish - grayish green in colour and hatch with fine hairs . As with other thistles , the tips of the leaves have spines . ball - like , reddish - purple flowers seem in May through June .

Distaff Thistle

Distaff thistle or Carthamus lanatus , an one-year thistle , can reach a height of from 2 to 4 feet . Flowers of the distaff thistle are oblong , yellow in colour , and flowering pass off from May through June . It has brand - like folio with fleece - same hairs and spiny tips .

Canada Thistle

genus Cirsium arvense , or Canada thistle , is a perennial that can scatter rapidly through its horizontal roots and by seeding . It is easily identify by its lobate and oblong leaves , which are waxy , unripened in color and spine tipped . lilac-colored flowers look in the calendar month of June through July and are formed in clustering at the ends of the prow . Canada thistle will reach a height of 2 to 3 infantry .

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