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While no one has given a definite reason for this, it is presumedthat the sudden changes of climatic condition are responsible forthe failure of many plants. In general, in the selection of ever-greens, the more tender varieties should not be far removed fromclimatic conditions in which they are known to be perfectly hardy, unless the person using such plants expects the inevitable loss whichwill be experienced during a very severe winter. 2. Condition of the Soil. The question of soil conditionswith reference to the planting of evergreens is more important in theclayey sections of the Middle West than in most of the other sectionsof the country. In the northern portions of the Middle West this isnot so evident, because the summer months are not as hot and dry asthey are farther south. Even the more hardy evergreens will notwithstand the stiff clay conditions of the Middle West during the hotsummer months, at which times this clay bakes very hard. Ever-greens, to be grown most successfully, should be planted in a loose,sandy-loam or clay-loam soil, and should not be planted directly in asoil the predominating portion of which is clay. Therefore the soilconditions should be examined closely before it is definitely decided touse evergreens, and the list of evergreens shown under IX-B are thosewhich are most hardy and best adapted to the climatic conditions andsoil conditions of the Middle West, as proven by years of experienceand careful observation. |
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