Pyrethrum is a natural insecticide extracted from the Chrysanthemum cinerariaefolium plant. Natural is not a synonym for “safe,” however, and the chemical is toxic to mammals (especially cats), fish and insects. Pyrethrum is also toxic to bees, although not as toxic as many other insecticides.

Is pyrethrin bad for bees?

Pyrethrins are practically non-toxic to birds but highly toxic to honey bees. ... There is evidence that long term exposure to pyrethrins can cause reproductive effects in fish and aquatic insects.

Do bees like pyrethrum?

By choosing plants which have good flowers for the bees to eat from, you can provide an abundant and reliable food source for these important little friends. ... Thyme, sweet alice, coastal daisy, lemon balm, pyrethrum and anise hyssop are just some of the plants in this space.