Show 4 TAKEN FOR CANADA THIS THISTLE TL LE dull bull thistle not centrally generally trouble ome and may de be eradicated by good rotation ayt 8 terna weeds may bo be classified clasa ined in different dirr mays onu one of 0 tho the most useful CIA catlong IR Is based on tho length of urn tim the tile weeds live thie gives three blaum es 8 annual biennial und and perennial an nanual lual weed la to ono one that starts blurt from tho tile seed in tho tile pring into a plant which flowers and scads abo panic year and thou then dice dies or id af A A ap dull gull thistle showing flower flowers bomb rate leaf and nd roote roots other words nn nit annual weed ie to lives but ono one growing pia most alost of our weeds to thi clasa A weed Is ono one that lives for two anre taris tile arat year it starts from 10 lo seed onti and develops dovo lopa a n largo 1 tap rol root below the ground and a dy do satte of leaves abobo ground but dobo 1 not lower or seed 1 I hie he largo tap root la lo adred ht red full of food which elves gives the plant un all early start tho the follo following wInK spring from tho contor center of the tile u ro sotto of al leaver leaves a stalk la IS sent up tip vhal bears flo floweret werft and later wada at tho end of tile mccond year tho plant dies good illustration of this claas class of weds aro are tho the bit bu 1 thistly 41 I 1 and the burdock tho tile bull ie to otton often inlet akur for canada thistle it Is in how however evor much larger bind and anoro rs rugged ged tills weed na ma bo be by thin the plants from going to seed tor for two conre cutting once or twice in n x season will usually it ie Is not generally Bonc rally troublesome al well aa and disappears under good r rotation systems |