Also depends on the rose itself I think, personally. I have some more delicate roses that don't seem to like me at all (RedGold... one of my favorites) and they're sitting less than 2 feet away from BlueGirl, which are growing like weeds (but not fast enough to overcome the pigweed that takes over my yard every year.. this WILL be the last year I have pigweed, so help me god!!!).
Never thought about salts. Probably because I've never lived in a salty area.
