Most species have finely divided leaves (often highly aromatic) and clusters of daisylike flower heads that attract butterflies. Some have gray to nearly white foliage. Resist deer.
T. balsamita (Chrysanthemum balsamita). COSTMARY. Zones US, MS, LS, CS; USDA 6-9. Native from Europe to central Asia. Weedy, rhizomatous plant grown for its sweet-scented foliage (used in salads and sachets) rather than its tiny daisies. Leggy stems reach 3 ft. high; if these are cut back, the gray-green, finely scallop-margined basal leaves can make a nice edging for an herb garden. Divide clumps and reset divisions in late summer or fall.
T. coccineum (Chrysanthemum coccineum, Pyrethrum roseum). PYRETHRUM, PAINTED DAISY. Zones US, MS, LS; USDA 6-8. Native to Iran and the Caucasus. Bushy plant to 23 ft. high, 112 ft. wide, with very finely divided bright green leaves. Bears long-stemmed single daisies in pink, red, or white in spring; if cut back, may bloom again in late summer. Also available in double- and anemone-flowered forms. Excellent for cutting, borders. Divide clumps or sow seeds in spring. Double forms may not come true from seed; they may revert to single flowers.
T. densum amani. PARTRIDGE FEATHER. Zones US, MS, LS, CS; USDA 6-9. Native to Turkey. Sometimes sold as Chrysanthemum haradjanii. Low-growing (6- to 8-in.-high) plant, spreading slowly to make a mat about 112 ft. wide. Leaves are finely cut, silvery white, featherlike in appearance. Small yellow flower heads appear a few inches above foliage in late spring. Use in rock garden or as small-scale ground cover in bright, sunny area with good drainage. Can withstand some dry spells when established. One of the whitest-looking plants.
T. parthenium (Chrysanthemum parthenium). Zones US, MS, LS, CS; USDA 6-9. FEVERFEW. Native to southern Europe and the Caucasus. Compact, leafy, aggressive plant that spreads by volunteer seedlings. Leaves have a strong peppery scent that some people find offensive. Attracts beneficial insects. Selections are 13 ft. high. 'Golden Ball' has bright yellow flower heads and no rays; 'Silver Ball' is fully double, with only the white rays showing. In 'Aureum' (commonly sold in flats as 'Golden Feather'), chartreuse foliage is the main attraction. To propagate, divide the clumps in spring; or sow seeds in spring for bloom by midsummer.
T. vulgare. TANSY. Zones US, MS, LS, CS; USDA 6-9. Native to Europe. Coarse, rather weedy garden plant to 3 ft. tall, 2 ft. wide, with finely divided, bright green, aromatic (some say smelly) leaves. Small, buttonlike yellow flowers appear in late summer. Thin clumps yearly to keep in bounds. This plant is no longer used medicinally, though it is still grown in herb gardens. 'Isla Gold' has bright golden leaves. T. v. crispum, fern-leaf tansy, grows 212 ft. tall; it has finely cut foliage and is more decorative than the species.