Sometimes I amaze myself! I knew how the rust rating system worked the rust resistant rating does not mean a plant does not get rust or even a noticeable amount of rust. But, somehow that knowledge temporarily slipped from my brain.
The rust ranking notes explain that the system is based on a 5 point rating, anything ranked 1-2.9(best I can tell ) should be ranked rust resistant. Anything 3-5 should be ranked rust susceptible. So being there are rankings of 1.1 etc. I would assume those are just showing incrementally larger areas of rust, so a 1.1 should still be very rust resistant. I would think even a 2 ranking would not be bad, but I would not want to risk too much on a 3 - 5 ranked plant in my garden. So it does not appear that the ease with which a plant contracts rust is the measure, but the degree to which it displays rust. So really I think my 'Red Volunteer' should still be ranked as rust resistant! Sorry about that...do the rest of you agree with my interpretation of the rankings?
