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Higher maintenance than annual cosmos, this perennial species (Cosmos atrosanguineus) bears dark red flowers that smell like chocolate until fall temperatures dip below 50 degrees Fahrenheit. A ...
Gladiolus (from Latin, the diminutive of gladius, a sword [2]) is a genus of perennial cormous flowering plants in the iris family ... 'Nanus' is hardy to Zones 5–8 ...
Tuberous begonias are frequently used as container plants. Although most Begonia species are tropical or subtropical in origin, the Chinese species B. grandis is hardy to USDA hardiness zone 6 and is commonly known as the "hardy begonia". Most begonias can be grown outdoors year-round in subtropical or tropical climates, but in temperate ...
Spring flowering types also do well in areas with deciduous trees, where they flower and produce leaves before the trees completely leaf-out. Crocuses are grown in USDA winter zones 3–8. [118] Not all species are hardy in the upper zones; C. sativus is winter hardy in USDA zones 6 through 8, and C. pulchellus is hardy in zones 5 through 8. [92]
A well established clump of these in flower is quite beautiful and they are surprisingly hardy even into USDA Zone 5 with a heavy mulch. They easily succeed in USDA Zone 6 with only a moderate mulch of straw or leaves. These hardiness ratings only apply to plants in the ground with the idea of preventing the actual root system from being frozen.
Horticulturalist Wilhelm Miller wrote, "The common chrysanthemums of the florists (C. hortorum) are often called 'large-flowering' and 'autumn chrysanthemums,' to distinguish them from the hardy outdoor species. They are the blended product of C. indicum and C. morifolium, two species of plants that grow wild in China and Japan. The outdoor or ...