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GardeNet
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HortiPlex Plant Database
I can garden
Mac Donald College Horticultural Information center
The Montreal Botanical Garden
Mosaicultures Internationales montreal
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The (No) Problem Garden
The Quebec Rose Society
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Searchable Plant Encyclopedia
Seeds of Diversity
Virtual Garden

Online Catalogues:

 Au Jardin de Jean-Pierre
BG Plants
Champs Fleuris (daylilies and irises)
Gardenimport Inc.
HortiClub
Hortico
Jardin Iris & Plus
Jardin Lac Brome (daylilies)
  Johnny's Selected Seeds
McConnell Nurseries
  Ontario Seed Co.
Park Seed Company
Perennials
Pickering Nurseries
La Pivoinerie d'Aoust
Richter Seeds
Stokes
Seeds of Distinction
SEPI
Sid's Dahlias
Solana Seeds
Stokes Seeds
T & T Seeds
Thompson and Morgan
Veseys