Pyrethrum Daisy Perennial Plant Mixed Colors Flower 500 Seeds Plant Mature Height: full Sun Grow to 45 to 100 cm in height. Used as companion plants to repel pest insects from nearby crops and ornamental plants. Repel aphids, bed bugs (Cimex lectularius), leafhoppers, spider mites, harlequin bugs, ticks, pickleworms, and imported cabbage worms, among others, in gardens and farms.