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Tanacetum cinerariifolium Cultivation | Propagation | General Uses General Uses: The dried flower buds are the source of the insecticide 'Pyrethrum'[1, 4, 14, 18, 46, 57, 61]. The pyrethrins are produced in the yellow disc florets[169]. The highest pyrethrin content is from the flowers when they are in full bloom (1.22%) and lowest in the preceding period (0.71%)[240]. This insectide also kills many beneficial insects, though it is relatively harmless to mammals[4]. Another report says that it is non-toxic to mammals[238]. It is best used in the evening so that it will have lost much of its virulence by the morning[201]. Steep two handfuls of the dried powdered flowers in one litre of hot water for an hour. This mixture can be either pureed or strained and then used as a spray[201]. Once dried, the flowers or the powder retain their insecticidal properties almost indefinitely[238]. The growing plant can be used as an insect repellent in the garden[14, 18, 20]. Effective against mosquitoes and ants[201]. For further Tanacetum cinerariifolium gardening information |
