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IOO leaves and especially from the lower part of such plants as the roseswhich are particularly sensitive to this type of evaporation. It is forthis reason that plants which do not have well-ripened wood like thegolden bell and certain varieties of the deutzia are subject to injury be-cause of this evaporation. Other plants like the bush honeysuckleand lilacs which succeed in developing thoroughly ripened wood beforewinter approaches do not suffer so much. There are two importantsources of injury (outside of the gnawing by animals) which can causeplants to be injured during the winter months and as a protectionagainst which mulching is necessary. The first is abnormal evapora-tion from the roots and stems of plants that are in exposed situations,and the second a liability of being heaved from the ground where aclay loam soil is subjected to violent changes of freezing and thawing.It is for this same reason that standard roses and climbing roses arefrequently lost during the winter months because they are protectedby a thin covering of straw, and evaporation is allowed to continue,when, in reality, they should be taken down and buried in soil whichremains moist throughout the winter months and thus protects thestems against evaporation. |
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