OvS is an award-winning practice of landscape architecture based in Washington, DC. The firm, a Certified Business Enterprise, draws upon over four decades of engaging and sustainable place-making in the public and private realms. OvS believes strongly in the collaborative process and maintains a built portfolio that demonstrates what is possible when art, science and environmental sensitivity equally drive design. The firm’s diverse mix of commissions ranges from urban corridors, monumental civic spac­es and institutions, to estates and urban residences. These outdoor spaces are programmed for a variety of active and passive uses and offer a humanizing connection to the land and surrounding context.

In 2014, OvS was awarded the American Society of Landscape Architects’ Landscape Architecture Firm Award. The award recognizes a “distinguished body of work that influences the professional practice of landscape architecture.”


Lisa E. Delplace

Lisa’s extensive knowledge of ecological processes and her deep commitment to their artistic execution result in a strong sculptural relationship between architecture and landscape.
Read Lisa’s Bio

Eric D. Groft

Eric has over 30 years of experience in residential, commercial and institutional work. Eric’s frequently published design accomplishments.
Read Eric’s Bio

Sheila A. Brady

Sheila’s design achievements include many of the firm’s distinguished projects. Recent work includes the Native Plant Garden and the Azalea Garden at New York Botanical Garden.
Read Sheila’s Bio


Wolfgang Oehme and James van Sweden launched their partnership in 1975 in the basement of Jim van Sweden’s Georgetown row house.

Their collaboration has been credited with founding the ‘New American Garden’ style of landscape architecture. The style is characterized by large swaths of grasses and layered masses of perennials that boldly celebrate the ephemeral through mystery, intrigue, and discovery. Jim van Sweden said the New American Garden is “Vigorous and audacious…vividly blending the natural and the cultivated.”

Their design credits include the planting along Pennsylvania Avenue from the U.S. Treasury to the National Gallery in Washington, DC; the Virginia Avenue Gardens of the Federal Reserve in Washington, DC; the National World War II Memorial in Washington, DC; the Gardens of the Great Basin at the Chicago Botanic Garden; as well as numerous residential gardens in the United States and abroad.

Wolfgang Oehme passed away in December 2011 and Jim van Sweden passed away in September 2013.


The Artful Garden

by James van Sweden & Tom Christopher


Architecture In The Garden

by James van Sweden


Bold Romantic Gardens

by Wolfgang Oehme & James van Sweden


Gardening With Nature

James van Sweden


Gardening With Water

James van Sweden


Process Architecture

Wolfgang Oehme & James van Sweden

Innovation in Design

Hamptons Cottages & Gardens
September / October 2017

Glam Rock

by Stephanie Mahon
Garden Design Journal
February 2017

Essential Stuctures

Garden Design
Winter 2017

Conspicuously Contemporary

by Kathy Hudson
Baltimore Style
June 2016

Form + Function

by Sharon Jaffe Dan
Home & Design
Fall 2016

Work What You’ve Got

by Jenny Andrews
Garden Design Magazine
Summer 2016

The New York Botanical Garden‘s Native Plant Garden is highlighted in the November 2015 issue of Martha Stewart Living.

OvS Highlighted in Autumn Issue of Garden Design

Oehme, van Sweden & Associates and Principals Sheila Brady, Lisa Delplace and Eric Groft were profiled in the Autumn  2015 issue of Garden Design. The Designer Portfolio feature included more than 37 full-color images of the firms most celebrated gardens.

Yard Art, Washington-Style

by Deborah K. Dietsch
The Washington Post Magazine
June 26, 2014

The Larger Vision

by Mac Griswold
Landscape Architecture Magazine
June 2014