Stingbugs don't feed on roots, only the aboveground parts, so what you may have seen on tomato roots was not stinkbugs. Probably what you see crawling out of the orchid medium is not stinkbugs either. They can also be beneficial insects, as they also feed on numerous insect pests, but stinkbug's damage to plants outweighs their usefulness as predators.
As for repotting, since usually orchids don't outgrow their pots very quickly, the main reason for repotting is to change the medium, so in a way you could consider it as changing it everytime.
Completely orchid obsessed and loving every minute of it....
My Orchid Photos
Last edited by camille1585; 11-15-2010 at 04:38 PM..