This article is currently not comprehensive and will be expanded as time permits me to do so. There is currently a patchwork of content and labelling laws in place in Canada with no consistent national standards (although there is an ongoing initiative to do this).
Relevant Federal Laws
Relevant British Columbia Laws
Relevant Ontario Laws
Explanation: BC Rules
This article provides a detailed overview of the wine content and labelling laws for BC .
In addition, the BC LDB (and other provincial liquor boards) require that any wine labels distributed in BC are approved by the Canadian Food Inspection Agency. The CFIA has an online guide to their wine labelling requirements here (see chapter 10 particularly).
Please also be aware that if you intend to distribute your product outside Canada, there will likely be requirements in the destination country. For example, all wine sold in the U.S. must get label approval from the federal Alcohol Tobacco Tax & Trade Bureau (TTB).