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Preferential planting of male trees in city landscapes may worsen allergies. Although male trees are lower maintenance and "litter-free," they are also the pollen producers. Females are able to attract pollen and act as a kind of natural air filter. In the absence of female trees, it is the mucous membranes lining our eyes, nose and throat that catch the pollen.
Read » Botanical Sexism Increases Pollen Count



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