Winter Seminar

* Registration is now closed for this event.

Perennial Plant Association & Horticultural Society of Maryland present:

Perennially Inspired!

A day-long seminar with horticulture experts.  Get ready for another stellar lineup of speakers at the annual Winter Seminar sponsored by the Perennial Plant Association and the Horticultural Society of Maryland.

Saturday, February 16, 2019

Registration: 8:00 a.m.
Welcome remarks: 8:45 a.m.
Program of speakers: 9:00 a.m. to 4:00 p.m.

The Conference Center at Sheppard Pratt
6501 N. Charles Street, Baltimore, MD 21204


$105 for current PPA and HSM Members; $125, if purchased after February 1
$125 for Non-Members; $145, if purchased after February 1
Deadline for registration is February 9. No registrations at the door.

Cancellations: Refunds will be made, less a 20% processing fee, if cancelled prior to January 30, 2019. No refunds after that date.

One CEU, for each session, available from APLD (Association of Professional Landscape Designers).


Morning Sessions | 9:00 a.m. to 12:30 p.m.


Nigel Dunnett
Creating and maintaining High-Impact, Low-Input landscapes using ‘Designed Plant Communities’

Nigel is inspired by the wild, by the experience of nature. It’s a strong emotional response. In this presentation he will describe how he works with perennials in design contexts to create dramatic, very long-season “low input-high Impact’ landscapes and gardens that recreate the positive uplifting immersive emotions of being surrounded by beautiful and breathtaking flowering nature.

Nigel Dunnett integrates ecology, horticulture and design in the built environment. He includes plants in innovative ways in both private and public spaces. Nigel has authored key books on naturalistic planting design, rain gardens, water sensitive design, and green roofs. He is a Gold Medal winner in the Royal Horticulture Society Chelsea Flower Show and works widely as a consultant and designer. Nigel was principal planting design and horticultural consultant for the 2012 London Olympic Park. 

He is an ambassador for the RHS, and a former Garden Club of America/English speaking Union Interchange Fellow in Horticulture. 

Ching-Fang Chen
New Aesthetics for Public Parks

Culture and aesthetics greatly influence the way we think, and how we design and experience places. How can designers inspire people to relate to these values by translating them into design for public parks? Ching-Fang will share about her work with county parks where she weaves imaginative design into recreation, conservation and environmental education.

Ching-Fang Chen is a landscape architect with the Montgomery County Department of Parks of the Maryland-National Capital Park and Planning Commission.  She designs and implements high-profile capital improvement projects of countywide significance.  For the past decade, she has worked relentlessly to reinvent public parks by promoting good design and innovation. Her projects have received various awards and recognitions.  Prior to joining the public sector, she worked for Oehme, van Sweden & Associates, leading a wide range of projects in the Mid-Atlantic and Mid-west region. Ms. Chen was trained as a civil engineer and holds a Master’s Degree in Landscape Architecture from the University of Pennsylvania. 

Nick McCullough
Inside the Design: Executing the Vision

As a grower, designer and installer, McCullough’s Landscape and Nursery has the benefit of seeing through projects from the inception to maintenance. Owner and lead designer Nick McCullough will share how organizational structure and workflow process lead to exceptional end results. From growing the plants, to design and ongoing maintenance, he will share how collaboration with the homeowners is key to each and every step.

Nick McCullough studied both horticulture and art history at The Ohio State University plus landscape design in northwest England. Many of his projects reflect the classic design elements found in the English countryside. He is an APLD-certified Designer and self- described “Plant Nerd” who shares his passions through his design work and also via his blog,” Thinking Outside the Boxwood”. You may also follow him on Pinterest along with 3 million other followers!

Lunch | 12:30 – 1:30 p.m.

Afternoon Sessions | 1:30 – 4:00 p.m.


Dean Dietrich
Plants that Perform

We all know that, a plant’s worth is based on its performance in the landscape.  Moving from Northern Pennsylvania to the intense summer heat and unpredictable winters of Richmond, Virginia caused Dean to re-evaluate his list of go-to garden worthy plants.  Dean’s winners and losers list may help all of us rethink our choices in these changing climatic times. 

Dean grew up on a large family farm outside of Kutztown, PA. Being surrounded by agriculture all of his life led him to study ornamental horticulture at Pennsylvania College of Technology. After graduation, Dean found opportunities to work at Chanticleer, Filoli and Longwood Gardens gaining a passion for display horticulture. For the last 4 years, Dean has been the central garden horticulturist at Lewis Winter Botanical Garden in Richmond, VA.

David Mattern
Containers that Create Spaces

At Chanticleer, container plantings are utilized not only for the beauty of the plant combinations, but also for the transformative ways they influence a garden space. This talk focuses on the various ways David uses containers to create innovative mixed combinations that inspire from spring through summer.

David is a graduate of the Professional Gardener program at Longwood and also holds a degree in Landscape Contracting from Penn State University. David’s career in Horticulture led him to garden in various parts of the country, and abroad including England, and South Africa. At Chanticleer he cares for Chanticleer house and terraces, Vegetable garden, and potting shed and picnic house areas.

Many thanks to our 2019 seminar Sponsors:

With special thanks to our Winter Seminar partner:

The Perennial Plant Association

For questions, please contact us at