Three new Chrysanthemum ·hybrida, garden chrysanthemum cultivars: Red Daisy, White Daisy, and Coral Daisy, are the first in the Mammoth TM series that are advanced interspecific hybrids derived from an open-pollinated cross between hexaploid C. weyrichii (Maxim.) Tzvelv. · C. ·grandiflora Tzvelv. These cultivars are backcross or inbred derivatives of the original interspecific F 1 hybrids. All three cultivars are U.S. Department of Agriculture Z3b (-34.4 8C to -37.2 8C) winter-hardy herbaceous perennials exhibiting a shrub habit with the cushion phenotype. Additional traits exhibited by these three cultivars are butterfly attractants, frost tolerance of the flowers, and genetic 'self-pinching.' These Mammoth TM cultivars are clonally propagated, virus indexed, protected by U.S. Plant Patents and Canadian Plant Breeder's Rights, and are available from the North American exclusive licensee Ball Seed Company.Chrysanthemums (Chrysanthemum ·grandiflora Ramat.; =Dendranthema · grandiflora Tzvelv.) are popular cut flowers, potted flowering plants, and perennial garden favorites worldwide with thousands of cultivars available (Anderson, 2006). Garden chrysanthemums are the number one herbaceous perennial in the United States, with a wholesale farmgate value of $141.845 million in (U.S. Dept. Agr, 2006. Numerous factors contribute to the long-term popularity of garden chrysanthemums, including fall flowering (most cultivars are obligate shortday plants), a wide range of flower types and colors, distinct plant habits (upright, cushion, groundcover), and winter hardiness (particularly for northern gardeners

Additional index words. Asteraceae, chrysanthemum breeding, Dendranthema, winterhardiness, herbaceous perennials Mammothä 'Yellow Quill' (U.S. Plant Patent 15,027; Canadian Plant Breeders' Rights Certificate No. 2951) is a new interspecific garden chrysanthemum cultivar, Chrysanthemum •hybridum Anderson (=Dendranthema •hybrida Anderson) with common names of hardy mum, chrysanthemum, and garden mum. It is a new and distinct form of shrubtype garden mum in the Mammothä series with spoon-shaped ray florets, frost-tolerant flower petals, self-pinching growth, and

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Mammoth™ ‘Twilight Pink Daisy’ (U.S. Plant Patent 14,455; Canadian Plant Breeders’ Rights Certificate No. 4192) is an interspecific garden chrysanthemum cultivar, Chrysanthemum ×hybridum Anderson (= Dendranthema ×hybrida Anderson) with common names of hardy mum, chrysanthemum, and garden mum. It is a new and distinct form of shrub-type garden mums in the Mammoth™ series with rosy-pink ray florets, a dark “eye” color in the center of the disc florets, frost-tolerant flower petals, and self-pinching growth. This cultivar is a butterfly attractant in the garden. Mammoth™ ‘Twilight Pink Daisy’ is a winter-hardy herbaceous perennial in USDA Z3b–Z9 (Southeast)/Zone 10 (West) with its cushion growth form displaying extreme hybrid vigor, increasing in plant height from 0.46 m in its first year to a shrub of 0.76 to 1.22 m in the second year and thereafter with greater than 3000 leaves/plant. Flowering is prolific, covering the entire plant at full flowering with as many as greater than 3500 flowers in the second year. Chemical abbreviations: ethanol (EtOH), indole-3-butyric acid (IBA).