Hardy In Zone: C. medius blooms with lavender-purple flowers in October. Height is 4 inches and the leaves show up after flowering is finished. It is hardy in zone from Zone 6 south.
C. orhroleucus starts in mid-October and if temperatures are a bit above normal, will continue to November. The flower is a delicate cream color with the throat stained with orange, and compared with other crocuses, the flower seems thin and papery. Where snows come early in the North C. orhroleucus will need a sheltered spot, but it's hardy in zone from Zone 5 south.
C. byzantium has rosy lilac flowers, often up to 4 inches across, blooming in September. The plants grow 6 inches tall and the leaves of spring are up to 16 inches long. This species is hardy in zone from Zone 6 south.
C. cilicicum have flowers of a deeper shade of rosy lilac than C. byzantium, 5 inches high, and of a greater number. The 12-inch leaves appear directly after flowering. They are hardy in zone from Zone 5 south.See Also Hardiness Zone Map:There are eleven hardiness zones, which are defined according to lowest winter temperatures. Zone 1 represents the coldest conditions, with winter temperatures below -50°F (-46°C); zone 11 is the warmest, wit] a minimum winter temperature of above 40°F (above 4°C). The classification of a plant into a particular hardiness zone means that the plant will normally thrive in that zone and also in any zone which is marked with a higher number.
This hardiness zone map will help you measure the degree of cold that a plant can tolerate in your area. The lower number represents the coldest temperature in which the plant can survive and the higher number refers to the warmest temperature in which the plant will thrive. Some plants, such as hardy bulbs, actually need winter chilling and will lose vigor in a warm zone. No zones have been given for annuals because they do not usually live through the winter.
The plants listed in this book carry a hardiness rating. This indicates that it will flower at the average minimum winter temperature that is given for that zone.
On The Other Hand See Climatic Zone:In California, grapes are grown in at least ve climatic zones, based on daily average tem-erature summation about 50° F (10° C) for the rowing season. Zone I has less than 2,500 de-ree-days; II, 2,501 to 3,000; III, 3,001 to 3,500: V, 3,501 to 4,000; and V above 4,000. The rape growing regions of Germany and northern France are in Zone I. Bordeaux and the PiedŽmont region of Italy are in II. Tuscany is in IV. Sicily and Andalusia are in V.
Nearer the poles are climatic regions conŽtrolled by polar air masses [2]. Despite brief, sunny summers they tend to be cold and dry throughout the year. The broad boreal zone is forested, the tundra zone supports shrubs,
rough grassland and mosses. The true polar climate, which covers the northern fringes of Canada, Europe and Asia and the whole of the Antarctic continent, is generally too cold and dry to support any but the most meagre and hardy vegetation.
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