If I have my plants outside, is the only real way to just cover them with a net? I assume if a bee or other bug goes on one flower then hops on another flower from a different plant, that it would be cross pollinated. I have a bunch of different plants in close proximity so I'm thinking if I should maybe group them together at least - all orange habs on one side and all chocolate habs on another...etc or is it pointless to do so?