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Gardeners have often looked to companion plants for pest control, as well-matched partners can attract natural enemies like syrphid flies and parasitic wasps to act as biological-control agents.

The loudly buzzing syrphid fly, often mistaken for a bee, lays its eggs on leaves of aphis-infested plants; the hatching larvae then consume immense numbers of aphids.

Chemical sprays give only partial control and are lethal to beneficial insects such as lady beetles, syrphid flies and lacewings that feed on thrips.

The brilliant white blooms with their hot yellow stamens emerge from the soil without competition and become beacons for impatient, flower-starved suitors like still cold-clumsy bumble bees, syrphid flies, butterflies, moths and beetles.

They attract bumblebees, sweat bees and syrphid flies.