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PYRETHRUM

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Originally appearing in Volume V22, Page 689 of the 1911 Encyclopedia Britannica.
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PYRETHRUM . The pyrethrum or " feverfew " (nat. ord. See also:

Compositae), now regarded as a See also:section of the genus Chrysanthemum, See also:flowers in the See also:early summer months, and is remark-able for its neat See also:habit and the See also:great variety of See also:character and See also:colour which it presents. The type See also:form is the Caucasian See also:species P. roseum of botanists, See also:hardy perennial, with finely cut leaves- a1Td large See also:flower heads, having a See also:ray of deep rosecoloured}1gurAtl florets surrounding the yellow centre or disk. They See also:bloom during the months of May and See also:June, as well as later, and ar iaghrvay's' Most welcome ornaments for the flower See also:borders, and useftli Ur'htjtting for decorative purposes. There are now many I'eitc llent`varioties, both single and See also:double-flowered, in cultivation' " Tli pyrethrum grows best in See also:soil of a loamy texture ; this should be well fiiariu''e'd' arid deeply trenched up before planting, and shotildll mulched iv the See also:spring by a See also:surface dressing of See also:half-decayed manure,; i Tlae; plantn may be increased by See also:division, the See also:side shoots beitkg,tfl keq;4 ,eearl in. spring rather than in autumn, with a portion of ,roots attached. _ See also:Plants disturbed in autumn frequently See also:die cdhiiingi rhe, See also:winter.. ''f`See also:ney may be placed either in See also:separate beds or i'n he}tiiizketl floWeV'fivYder as may be required. In beds they can be;snpplerwentect as the See also:season passes on by the intermixture of later blg9fni sy,,bjects, such as gladioli. Slugs are often destructiv. t,9, 7jl} See also:yogi}gg s~h,9ots, but may be checked by a few sprinklings of sod or'Iitile Seeds Should be sown in spring in a See also:cold See also:frame, and the P,u4i ""'T3larrts sliiiiiM be put out into beds when large enough, ane4n hould 86w+ev;.thd ,following May. New varieties are being coftgtatfl{ly rirytrodtugd t t p reader is referred to the catalogues of nurseiiyi i fait, atpe{l, Inds. The powdered See also:root of P. roseum and other ~~ppeeies l's'hsed',ih the manufacture of See also:insect powders.

P. parthenifHlilim'` See also:

var. dui'einn is the " See also:golden-See also:feather " of gardens, so much en4gk y't d ns>ran!,e9ging to flower-beds. P. parthenium, See also:pellitory or if lvor>fe ," was formerly used in See also:medicine. Its double-flowered form is well See also:worth growing. P. uliginosum is the," great ox-See also:eye See also:daisy " that flowers in See also:September and See also:October.

End of Article: PYRETHRUM

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