Marshall Green is a fourth-generation owner and the dedicated nursery manager at Primex Garden Center in Glenside, Pennsylvania. After growing up around Primex, Marshall attended New England Culinary Institute and pursued a career as a chef in Philadelphia. In 2014 Marshall came home to Primex where he settled in as the woody plants buyer and nursery manager. As the woody plants buyer, Marshall is well attuned to current plant trends and is always looking for the next ‘it’ plant. You can easily spot him in the nursery, typically donning a wide-brimmed straw hat, eager to help and share his extensive knowledge.

Marielle Drennan is the owner of Champion Tree & Plant Health Care, a full-service plant health care company based out of King of Prussia, Pennsylvania and servicing the Main Line and surrounding areas. Marielle is an ISA Certified Arborist® and a Pennsylvania Department of Agriculture Certified Pesticide Technician. Prior to forming Champion Tree, Marielle worked on her husband's pruning crew for several years. She is a passionate collector of David Austin and antique roses, as well as a Pennsylvania Big Tree enthusiast. Marielle is a graduate of Washington and Lee University, in Lexington, Virginia where she majored in mass communications and double-minored in studio art and film and visual culture studies.

Robert Lundgren has a Bachelor of Plant Science and Fine Arts minor from the University of Delaware, and a Master of Landscape Architecture from the University of Pennsylvania. He worked at landscape architecture firms, Olin and Andropogon and is now at Penn working as the University Landscape Architect within the Facilities & Real Estate Services Division, shepherding a variety of landscape projects on the 300-acre campus arboretum. He is an artist, an award-winning designer and an avid naturalist. His responsibilities at Penn include research, campus planning, tree care and management, garden design, ecological and environmental initiatives and maintenance protocols.

Doug Oster is the Pittsburgh’s Garden Guru and host of the popular radio show The Organic Gardener on KDKA radio every Sunday morning. He writes a gardening column for The Green Voice, the newsletter for Pittsburgh Earth Day.

Oster appears on KDKA-TV’s Pittsburgh Today Live as a contributor.
He’s also host of the Talking Trees podcast for the Davey Tree Expert Company along with starring and producing In Doug’s Garden, a weekly television show for CBS/KDKA Streaming.

Oster is proud to work as a consultant with Farm to Table of Western Pennsylvania/Buy Fresh Buy Local. In that capacity he teaches organic gardening classes, helps in the creation and maintenance of local gardens, and works with the team to help underserved communities.

In addition, Doug hosted, produced and wrote the one-hour special “The Gardens of Pennsylvania” for PBS which won the Emmy for Outstanding Documentary.

His fifth book, “The Steel City Garden; Creating a One of a Kind Garden in Black and Gold” demonstrates how to create a garden using Pittsburgh’s favorite colors.

The garden personality has a strong following on Facebook, Twitter, and Instagram.

Oster’s most satisfying accomplishment was founding Cultivating Success, a garden program for foster and adoptive children.