March 28, 2025

Ontario boasts a thriving landscape design scene, where creativity meets functionality to enhance both urban spaces and natural systems. From Toronto’s bustling cityscape to the scenic beauty of Southern Ontario, these firms are redefining outdoor environments through a blend of multidisciplinary expertise and a commitment to sustainable design. Their work not only transforms the public realm but also fosters connections between people and nature, creating vibrant, resilient communities. Here are the top 7 landscape architecture firms in Ontario:


1. DTAH (DONOVAN, TILLETT, HOSKIN, AND ASSOCIATES)

Based in Toronto, DTAH is an award-winning multidisciplinary design firm specializing in architecture, landscape architecture, and urban design. Their transformative projects invigorate the public realm while enhancing urban and natural systems.

2. PMA LANDSCAPE ARCHITECTS LTD.

PMA is a renowned Canadian firm offering comprehensive planning and design services for both public and private projects. Their award-winning work reflects a deep commitment to innovative and sustainable landscape architecture.

3. PLANT ARCHITECT INC.

Founded in 1994 and based in Toronto, PLANT Architect Inc. is an interdisciplinary firm that seamlessly merges architecture, landscape architecture, and installation art. Their creative approach explores design at various scales and the dynamic intersections between these disciplines.

4. GH3 (GH3 STAR)

A Toronto-based practice led by founding principals Pat Hanson and Raymond Chow, gh3 is recognized for its work in architecture, urbanism, and landscape design. Their projects, ranging from private residences to civic infrastructure, merge modernist values with sustainable design strategies.

5. BSQ LANDSCAPE ARCHITECTS

Located in Toronto, bsq Landscape Architects provides artistic landscape design, project management, and construction services. Their diverse portfolio spans intimate residential gardens to expansive commercial and public spaces, all marked by meticulous attention to detail.

6. OMC LANDSCAPE ARCHITECTURE

Serving Hamilton, Halton, Niagara, and Southern Ontario, OMC Landscape Architecture is an award-winning firm that designs landscapes to invigorate public spaces and improve the performance of urban and natural systems.

7. WELWYN WONG LANDSCAPE DESIGN

Based in Ottawa, Welwyn Wong Landscape Design specializes in creating unique, custom residential landscapes that reflect the distinctive character of each site. Their award-winning designs celebrate the individuality of outdoor spaces while promoting sustainability.


Ontario’s landscape architecture firms are at the forefront of blending art with sustainability, transforming ordinary outdoor spaces into extraordinary environments that enrich communities and honor the natural beauty of the region. Whether you’re envisioning a serene residential retreat or a dynamic public space, these professionals are ready to bring your vision to life with innovative design and enduring quality.