Thomas Leo Ogren
THOMAS LEO OGREN is a former landscape gardening instructor
and nursery owner and is the creator of the Ogren Plant
Allergy Scale (OPALSTM), the first plant-allergy ranking
system now used by the USDA. He lives with his family in San
Luis Obispo, California.
Log In to see more information about Thomas Leo Ogren
Log in or register now!
Series
Books:Safe Sex in the Garden, March 2003
Trade Size (reprint)
Allergy-Free Gardening, June 2000
Trade Size
|