the flour thing is a trick that one of the growers featured in 'marijuana success vol 2' used to hide plants in his garden. i have yet to try it, as i am a happy INDOOR grower lol, but the theory behind it is that LEO and ripoffs are looking for a certain shade of green. tweak it, and you could throw them off.
but IMHO that technique is better suited to a situation where you have a perennial garden full of ornamental plants and want to toss a couple cannabis girls in there... disguising them as decorative foliage plants would keep Grandma from IDing them when she comes for the labor day BBQ, lol.

The tomatoes between rows is more practical, because
a) growing veggies in rows is nothing out of the ordinary- you'd have to be looking close to be like, um, there's not just tomatoes down there.... wtf!
b) tomato foliage looks jagged from afar and cannabis blends in
c) the shade of green is fairly similar
d) the fruit are distracting and you can even hang red spray-painted Christmas tree ornaments off your pot plants so they look like maters
e) can i have some tomatoes? lol i live near you and like to make vast quantities of spaghetti sauce for the long Berkshires winters... kidding. you keep your maters and make your own sauce.