# Different Species of Mums
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Garden
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The species commonly grown by home gardeners (Chrysanthemum morifolium), originated in Japan and China, but has become naturalized in many parts of the world, including the United States. The plants in this species reach 12 to 36 inches high and thrive in U.S. Department of Agriculture hardiness zones 5 to 9. Place most varieties of Chrysanthemum morifolium about 18 to 24 inches apart when growing them in the soil. A few types might need spacing of 30 to 36 inches.
Medicinal
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Certain species of chrysanthemums figure prominently as medicinal herbs, including the Chrysanthemum parthenium, also known as feverfew, which has been a traditional remedy for headaches, toothaches and fevers. The Chrysanthemum leucanthemum is used to treat whopping cough and some skin disorders. The Dalmation pellitory (Chrysanthemum cinerariafolium), has a reputation as a strong insect repellent, according to the Gale Encyclopedia of Alternative Medicine. Professionals grind the flowers to make an insecticidal powder.
Banned
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The disease chrysanthemum white rust attacks certain species in the chrysanthemum family. The U.S. Department of Agriculture has banned importation of susceptible species originating in certain countries. Species vulnerable to the disease include Chrysanthemum morifolium, Chrysanthemum nipponicum, and Chrysanthemum pacificum. White rust creates small white or yellow spots on the leaves of the plant and eventually turn brown. Some species, such as the annual chrysanthemum, are resistant to the disease.
Invasive
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Invasive plants spread throughout colonized areas quickly and compete for resources with native plants. In some cases, they make harmful changes to the ecosystem. One species of chrysanthemum (Chysanthemum coronarium), has become an invasive plant in some locations, including Southern California. The plant produces numerous seeds that develop rapidly, giving it a competitive advantage over other plants in the ecosystem. It thrives in disturbed locations and can produce dense stands in these types of habitats.
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