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Regions Cultivation: The cool moist atmosphere of London makes cultivation of chrysanthemums, cinerarias, primroses, and the cool-loving bulbs comparatively easy in the home or a small greenhouse. The more severe winters of Chicago call for steam heating of apartments, and the choice of plants would turn to those, such as the members of the Arum family, that thrive under warm conditions. Plants of both regions cultivation have a common enemy, the dirt from factories, the annual fall of which is measured in tons. In both regions cultivation outdoor and indoor plants alike need frequent washing. Chicago gives the added difficulty of frequent gales of high velocity.
Cultivation. Cultivation is an ancient vineyard practice. It destroys weeds and facilitates other vineyard operations such as irrigation. Contrary to common belief, cultivation does not conserve soil moisture; however, the resulting destruction of weeds does conserve moisture. Discs or chisel-tooth cultivators are used, although some vineyards are still plowed. Heavy disc harrows are used to turn under weeds and cover crops. Weeds have been and are sometimes controlled with oil sprays or chemicals, usually diuron or monuron.
The petals are te, with greenish or yellowish veins, and each rs a cluster of gland-tipped sterile filaments s base.
Grasses-of-Parnassus are native to northern perate and Arctic regions cultivation. One species palustris, grows in Arctic tundra and in shaded areas along streams in the mountains of North America, Europe, and Asia. It does well under cultivation if given enough water.
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