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As a rule, native collected plants seldom or never succeed whentaken directly into the congested city districts, and only those plantsamong the deciduous shrubs and trees which are smooth-leaved areto be recommended for trial. LIST OF PLANTS FOR USE IN CONGESTED CITY DISTRICTS A. Trees. This group contains trees which may be used with agreat deal of certainty that they will thrive under city conditions ofcongestion and dusty atmosphere. Wherever possible, these trees,especially evergreens, should be thoroughly sprayed at frequentintervals to wash a considerable portion of the dust from the surfaceof the leaves. |
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