Major and significant Botanic Gardens in Canada are listed - by Province and then alphabetically
This page is a 'work in progress'

British Columbia

Butchart Gardens - designated a National Historic Site of Canada and receive over a million visitors each year. Essentially a floral show garden rather than a Botanical Garden. Over a million bedding plants in some 900 varieties and 300,000 bulbs provide continuous blooms between March and October. The gardens were developed in an old quarry and cover occupies approximately 5.26 hectares. Located 21 kilometres north of Victoria, British Columbia.
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Sunken Garden in Butchart Gardens
University of British Columbia Botanic Garden
Address: 6804 S.W. Marine Drive, Vancouver, British Columbia V6T 1Z4 
Canada’s oldest university botanic garden. Now over 100 years old, it was established in 1916 with the aim of better understanding the native flora of British Columbia. Its current mission is to assemble, curate and maintain a documented collection of temperate plants for the purposes of research, conservation, education, community outreach and public display. Covers 44 hectares / 110 acres. Includes over 8,000 different kinds of plants. Approximately 120,000 plants represent some 6,000 taxa with significant collections of Magnolia, Acer (maples), Sorbus (mountain ash, Styracaceae (storax family), Rhododendron and climbing plants. It includes a native plants garden, a food garden and a physic (medicinal) garden. 
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University of British Columbia Botanic Garden
LIST OF BOTANIC GARDENS AND ARBORETA

Manitoba
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Assiniboine Park Conservancy
Address: 55 Pavilion Crescent | View Map | Winnipeg, MB Canada, R3P 2N6
Phone: 204-927-6000
The original Assiniboine Park Conservatory has now been demolished.  In its place is a brand new world class conservancy called Canada's Diversity Gardens. There is a beautiful biome/conservancy called The Leaf which contains four distinct biomes;
  • the Hartley and Heather Richardson Tropical Biome,
  • the Mediterranean Biome,
  • Babs Asper Display House, and
  • the Shirley Richardson Butterfly Garden.
  • plus Canada's tallest indoor waterfall!​
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The Leaf at Assiniboine Park Conservancy
Outdoors, the Gardens at The Leaf comprise c.30 acres of gardens and greenspace which include six gardens; the Indigenous Peoples Garden, Kitchen Garden, Sensory Garden, Performance Garden, Seasonal Garden, and The Grove.

Note: The Wikipedia article needs updating
Other gardens in Manitoba:
  • Manitoba Horticultural Association Arboretum, International Peace Garden, Boissevain, Manitoba, R0K 0E0
  • Morden Research Station, Morden - specializes in developing improved varieties, production and protection practices to enhance the marketability of ornamentals, flax, field peas and beans for the prairie region.

Ontario

Royal Botanic Gardens, Ontario
​Address: 680 Plains Road West, Burlington, Ontario, Canada
Located in Hamilton, Ontario, the RBG is the largest botanical garden in Canada and a National Historic Site. RBG was created to serve as both a regional botanical tourism site and an environmental agency. It now focuses on: Conservation, Education, Horticulture and Science. It comprises four formal gardens - including 400 acres of display gardens - and contained within 1,100 hectares of nature reserve:
  • RBG Centre and Hendrie Park: 680 Plains Road West, on the border of Burlington and Hamilton in Ontario, Canada.
  • The Arboretum and Nature Interpretive Centre: 16 Old Guelph Road in Hamilton, Ontario.
  • David Braley and Nancy Gordon Rock Garden: 1185 York Boulevard in Hamilton, Ontario.
  • Laking Garden: 1229 Spring Garden Road in Burlington, Ontario.
  • Trail Heads: multiple addresses. See trail maps for details.
  • Plus 980 hectares (2450 acres) of nature sanctuaries that contain environmentally sensitive lands and diverse ecosystems connecting the Niagara escarpment to Lake Ontario. The environmentally sensitive habitats are considered an important plant biodiversity hotspot for Canada
  • see detailed map
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Plan of Royal Botanic Gardens, Ontario
Toronto Botanical Garden
Address: 777 Lawrence Avenue East at Leslie Street, in Toronto, Ontario, Canada
Designated a botanical garden in 2003. TBG does not receive funding from the provincial or federal governments, and produces over 95% of its operating budget from self-generated income. 
  • Nearly four acres of botanical garden with 17 themed gardens designed to educate and inspire.  
  • Approximately 250,000 people visit the garden each year 
  • It has 4,527 plants, represent 2,610 taxa (species and cultivars) from 116 plant families​​
  • Home to a remarkable archive and historical collection. ​The TBG's Weston Family Library is the largest private horticultural library in Canada and hosts consists of over 10,000 books and magazine titles and the largest library collection of materials in Canada which supports hobbyists, researchers, and the public. 
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Plan of the 17 themed gardens at Toronto Botanical Garden

Quebec

Montreal Botanic Garden
- Founded in 1931, it is located opposite the Olympic Stadium. In a space covering over 75 hectares, it comprises 22,000 plant species and cultivars, 10 exhibition greenhouses, some 30 thematic gardens and the Frédéric Back Tree Pavilion.  It includes a First Nations Garden, a Toxic Plants Garden and a Medicinal Plants Garden. It also includes an extensive Library of botanical and horticultural publications.  This is a map of the garden.

List of Other Botanical Gardens in Canada
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Alberta
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Muttart Conservatories Edmonton Alberta Canada

Manitoba

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