Author of Designing with Palms (Timber Press, 2018), Jason Dewees is the horticulturist and palm expert at Flora Grubb Gardens, in San Francisco.

A volunteer at the San Francisco Botanical Garden since 1994, he works as a horticultural consultant for landscape designers, landscape architects, and gardeners. He has offered guidance to the Conservatory of Flowers, Golden Gate Park, the University of California Botanical Garden, the City of San Francisco, the Presidio Trust, the San Francisco Department of Public Works, and the San Francisco Botanical Garden, trained volunteers and docents, and has propagated thousands of trees. 

He has lectured at the California Horticultural Society, The Huntington Library, Art Collections, and Botanical Garden, the Marin Art and Garden Center, the Mill Valley Outdoor Art Club, the Sherman Library and Gardens, and the Garden Conservancy.

Jason joined the Northern California Chapter of the International Palm Society as their youngest member in 1986, and has served on the council of the California Horticultural Society, as well as on the Horticultural Advisory Committee of the San Francisco Botanical Garden, and the Advisory Council of the Conservatory of Flowers. Born and raised in San Francisco, he graduated from Wesleyan University in Middletown, Connecticut.