Living Landscape Function Calculator

Online Resource of Plant Functions

Shared with the permission of Timber Press 

About Us

These are the people I work for. 

My hope it that my granddaughters, Ruby and Amelia, will have a healthy, diverse world full of butterflies and birds to share with their grandchildren.

Christopher S. Sohnly

Christopher earned a Bachelor of Science Degree in Landscape Architecture from Temple University in May of 2015.  He has worked in Gardening and Landscaping for over 15 years in a wide range of applications.


Currently Christopher is the owner and operator of Spruce Hollow LLC, which provides garden design, installation and maintenance with a focus on native plants in Philadelphia, PA in the Mt. Airy, Chestnut Hills, Elkins Park neighborhoods and beyond.  Learn more about Spruce Hollow, LLC at


Doug Tallamy

Department of Entomology and Wildlife Ecology; University of Delaware Professor of Entomology

Rick Darke

Rick Darke heads Rick Darke, LLC, a Pennsylvania-based consulting firm focused on the conservation, design and management of living landscapes.

Doug Tallamy & Rick Darke


The Living Landscape

Timber Press 2015

Scroll to Top