The most specific figures I found for Canada: Of 417.6 million hectares of forest, 234.5 million hectares are "commercial forests", i.e., tree plantations.
The rest of the 3.47 million km2 is located in more remote and northern areas and often relatively undisturbed by human activity. Accessibility is the distinction, not if it's a plantation or not.
[1] https://www150.statcan.gc.ca/n1/pub/16-201-x/2018001/sec-2-e...
Don't forget that trees in Canada grow slowly compared to for example trees in a jungle.