Bees do it.
Plants do it, too, and humans can feel mighty miserable as a result.
Those of us who daydreamed through basic biology probably have forgotten that the plant world has sexual reproduction, too, and that there are male and female plants, or parts of plants. Thomas Ogren hasn't forgotten. Ogren, a former landscaper and horticulture teacher, immersed himself in researching plant allergens to create a landscape around his home that wouldn't aggravate his wife's allergies. What might be surprising, however, is the extent to which, he says, urban areas are overpopulated by pollen-producing plants. Knowing that pollen is produced only by male plants, he figured that planting females would be the key to an allergy-free garden.