Name: Sandy B. Ford River Twp, Michigan UP (Zone 4b) (Zone 4b-maybe 5a)
Arlyn, thanks so much for the very comprehensive instructions -- I starred your post so I'll have some hope of finding it again! My iris are only about 5-6" tall right now (other than a few the deer have munched ), so it seems I asked my question at just the right time. And I have both the daconil and soil sulfur, so I'm good to go...
Now if the weather would just warm up here!
“Think occasionally of the suffering of which you spare yourself the sight." ~ Albert Schweitzer C/F temp conversion
), so it seems I asked my question at just the right time. And I have both the daconil and soil sulfur, so I'm good to go... 
