Thomas Leo Ogren
THOMAS LEO OGREN has a master's degree in agricultural science and is the creator of the Ogren Plant Allergy Scale (OPALS), a plant-allergy ranking system now used by the United States Department of Agriculture. He is a horticulturist and allergy researcher as well as a former landscape gardening instructor, nursery owner, and gardening radio show host. He lives in San Luis Obispo, California.
THOMAS LEO OGREN has a master's degree in agricultural science and is the creator of the Ogren Plant Allergy Scale (OPALS), a plant-allergy ranking system now used by the United States Department of Agriculture. He is a horticulturist and allergy researcher as well as a former landscape gardening instructor, nursery owner, and gardening radio show host. He lives in San Luis Obispo, California. See less
Thomas Leo Ogren's Featured Books
Thomas Leo Ogren book reviews
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Allergy-Free Gardening: The Revolutionary Guide to Healthy Landscaping
Good Allergy Listing
by Tene, Apr 7, 2011
This is really just a long list of plants, what allergies they may cause, and how bad those allergies might be (each plant is rated). Interesting (especially if you suffer from allergies), but ... Read More
