You used it much more diluted than I did, Valerie! But it worked, which is the main thing and better to go with the lowest dose that works. Pouring it on the foliage may give a slightly quicker result but it sounds like you don't have a soil pH that interferes too much, or else your soil is just iron deficient (rarer). The main idea for pouring it on part of the foliage for a test is that you can see if it did anything, because the part you "ironed" should be greener than the rest of the plant in a couple of days. Once that's been determined to be the problem then other ways can be figured out to deal with it. Rugosa roses do prefer an acidic soil, for sure. If it's a pH issue then the teaspoon of vinegar in a litre of water poured on the soil around the plant should do the same thing by releasing the iron that's already there. Do you get any interveinal chlorosis in daylilies there?
