Can't relate
There are a lot of details that need to be filled in, but it seems the Canadian government are showing maturity and a logical streak almost unheard of in government worldwide.
The 4 plant personal allowance is fairly sensible, though I would point out that the hight limit does not impinge on the strength or weight yeild of a plant, but perversely, often the opposite, as tall plants can't carry heavy buds. That is something that, were I to be making such law, I would remove. In fact, allowing tall plants may start a move back to the cultivation of plants with a reasonable THC content in the leaves, for a nice mild smoke that older (and smarter) folk often prefer.
Unless taxation is high, this will remove the cannabis trade from criminals, organised or otherways, leaving it, one hopes, in the hands of decent people who have ethical concerns which supersede "gangsta" kudos and tawdry profits.
Should commercial cultivation be permitted, in addition to personal cultivation, the economies of scale would allow a fairly high tax to be applied, a decent profit taken, and yet the price to the end user to be lower than the "street" price of the illegal drug, really cutting organised crime out of the picture within about 6 months of the law coming into force.
This also means that sufferers of the many painful diseases that cannabis can help with can acquire and use the drug without landing themselves, or (often ethical) suppliers in a big can of undeserved legal whupass.
Well done so far Canada! Show the world the way!