Just remember, please, please, please, to clean the feeders with the liquid before refilling it. If mold starts to grow in the little openings, there's a good chance that it will make the hummers tongue swell so they can't eat. Not to be an alarmist, but just be aware. Letting them feed on nature's bounty is, of course, the best, but not always possible. We have some that visit a plant that is called "Mexican petunia" here...it's purple, but they come to it.