I am interested in this approach since we have a nice backyard with flowering plants and I like the dark/simple background effect. But there are couple of places that are not very clear.
You wrote: "Ensure that you use the lowest ISO setting available to minimize ambient light capture, generating increased background contrast. "
Could you clarify? In natural light only situation changing ISO affects _everything_ in the frame, not just background. This advice makes sense when using a flash - changing ISO affects areas not lit by the flash since flash adjusts to new ISO settings keeping the subject exposure the same.
Also: "If you need a darker background, increase exposure further in half-stop increments"
By increasing exposure you mean exposure time? Not sure how it would result in darker background.