When I grew the orchids outside, I just tossed a handful of Ironite in the watering can and let is slowly dissolve over time. When it was gone, I added another handful. Very scientific. Now I have these little plastic baskets that I can fill up with a combination of Ironite, slow-release fertilizer and oyster shell (if I get ambitious). What I actually do, though, is sprinkle a little on top now and then. I know it works its way to the bottom but the roots extend into the saucers so I figure they are getting what they need.
I always have Ironite on hand as I grow quite a few plants that need the occasional dressing of it (Cinnamon, citrus, Passiflora, Jasmines, etc.) All of these like a nice slow, steady feed of iron which Ironite does a good job of delivering. I have blood meal and bone meal, too, so whatever my little baby plants need, I give them.
