Marguerites can reach 3 ft. (90 cm) tall when left to grow naturally, such as A foeniculaceum (syn. Chrysanthemum foeniculaceum), which originated as a garden plant. The argyranthemums available for indoors have usually had their growing tips pinched out, or have been treated with a growth-restricting chemical to keep them at about 18 in. (45 cm).
They form bushy plants, some with deeply cut, blue-gray leaves, covered with masses of yellow or white flowers throughout summer. Once the plant has finished flowering, it can be planted outside. A. frutescens (syn Chrysanthemum frutescens) is another half-hardy, white-flowered species from the Canary Islands.
Size: Height 18 in. (45 cm).
Light: Direct sunlight.
Temperature: Keep cool; 55-65°F (12—18°C).
Moisture: Water plentifully to keep the soil thoroughly moist.
Feeding: Give standard liquid fertilizer every two weeks from spring to fall, or while in flower.
Propagation: Take tip cuttings, 4 in. (10 cm) long, in spring.
Special needs: Higher temperatures will shorten the flowering period.