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Botanical sexism is a term that describes the preferential planting of cloned male plants in urban areas because they do not produce fruits and flowers that litter the landscape. However, because males produce pollen, areas with only male plants can have high pollen in the air and, therefore, be inhospitable to people with pollen allergies.
Urban planners and tree experts have tried for decades to keep streets and sidewalks clear of maple spinners, seed pods and fallen fruit, but these efforts may be leading to an increase in allergies.
The pollen source in a given area depends on the type of vegetation present and the length of their bloom period. What type of vegetation will grow in an area depends on soil texture, soil pH , soil drainage, daily maximum and minimum temperatures, precipitation, extreme minimum winter temperature, and growing degree days .
The OPALS allergy scale was first published in Allergy-Free Gardening, by Thomas Leo Ogren, in 2000. [1] It covers over 3,000 common trees, shrubs, flowers, and grasses. [3] The allergy scale was updated and extended in 2015 in The Allergy-Fighting Garden. [4] [5] [6]
Young tree in natural habitat American chestnut male (pollen) catkins. Castanea dentata is a rapidly-growing, large, deciduous hardwood eudicot tree. [20] Pre-blight sources give a maximum height of 100 feet (30 m), and a maximum circumference of 13 feet (4.0 m). [21]
Botanical Name:Nyssa sylvatica Sun Exposure: Full sun to part shade Soil Type: Moist, well-draining, average Soil pH: Acidic (5.5-6.5) USDA Hardiness Zone: 3 to 9 Black gum, or tupelo, is an ...
Red maple is a good choice of a tree for urban areas when there is ample room for its root system. Forming an association with Arbuscular Mycorrhizal Fungi can help A. rubrum grow along city streets. [20] It is more tolerant of pollution and road salt than sugar maples, although the tree's fall foliage is not as vibrant in this environment.
The Morris Arboretum & Gardens of the University of Pennsylvania (37 ha / 92 acres) is the official arboretum of the Commonwealth of Pennsylvania. The Arboretum is open daily except for major holidays. It is located at 100 East Northwestern Avenue, Chestnut Hill, Philadelphia, Pennsylvania.
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