Answer: One of the very biggest problems of all for allergy sufferers is that most communities have planted all male trees in the interest of avoiding litter and debris that female trees produce, such as seeds, pods, etc. Unfortunately, male trees produce pollen and without female trees to trap that pollen, you have airborne pollen flying around without a place to go except up your nose! So if you have seedless, fruitless trees in your yard or garden, chances are you have male trees. Female trees produce NO pollen and, therefore, are your safest bets for allergy-free gardening. Female plants and trees receive the pollen grains and act like traps or air scrubbers.
With this in mind, some of the worst offenders are male versions of ash, poplar (especially Italian and Lombardy poplars), willow, cedar, juniper, cottonwood, mulberry, box elder, holly, yew, pussy willow, Chinese gingko, smoke tree, seedless honey locust, and berry-less junipers.
Trees and shrubs rated best, and those you should try in your own landscape, include dogwood, crabapple, cherry, redbud, magnolia, and female versions of yew, juniper (Bar Harbor, blue point, and Iowa), yew pine, poplar, box elder, some maples (especially female silver and red maples such as Autumn Glory, and October Glory), willow, sour gum, azalea, fir, peach, plum, pear, and ash. Any holly with red berries is also a good choice.
The best choices in flowers are daffodil, iris, hollyhock, impatiens, nasturtium, pansy, begonia, crocus, poppy, tulip, clematis, peony, zinnia, and fully double sunflowers and chrysanthemums. Other herbaceous plants with showy flowers that are OK include daisies, geraniums, petunias, and roses. Perfectly flowered plants don?t cause problems because their pollen is heavy and sticky and is transferred by insects not the air.
Hope this information is helpful!
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