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Potting Soil

You may be careful about choosing a houseplant that you’re not allergic to—most don’t pollinate, fortunately—but what about the dirt it’s planted in? Soil can harbor mold spores, a very common allergen, especially when plants are kept out of direct sunlight or aren’t given time to dry between waterings. Mold can also grow on leaves and stems that are too moist, and dust (yup, another allergen) can build up on plants that aren’t tended to often.