There's a very good thread entitled Butte's Bounty in the cannabis growing outdoors section that describes just such a topping regime to achieve topiary giants -
https://www.icmag.com/ic/showthread.php?t=213827&page=6
I don't mind them tall and pine-like, but they are vulnerable to strong winds...
https://www.icmag.com/ic/showthread.php?t=213827&page=6
I don't mind them tall and pine-like, but they are vulnerable to strong winds...