Back in the day (early 80's) I saw quite a few gardens that were surrounded by Sunflowers that were as high as the mj. Very effective screen, all worked well until October.
Privacy fencing, other plants, greenhouse, short growing strains, put them out late in the year so they don't get as tall, shade cloth on dark side, etc.
i have tried, worked for a while till the coptors started doing daily runs over to watch them grow lol, the day I saw the guys face as he slowly flew over head, had to chop um down 3 weeks early. We should be Rec legal soon. I am already getting a huge bed outside ready for when it happens!