In fact, once the birds know the location of the feeder, you could dilute the mixture with unsweetened water. Change the syrup every week so that it doesn't ferment. While you're replacing the syrup, you should also clean the feeder. Wash it out with water and vinegar, using a scrub brush. If bees or wasps are a problem, coat the feeding hole with a bit of salad oil.
Ants can become regular visitors to the feeder, too.
It's best to locate the feeder in the shade. Try to keep it away from the window so the bird doesn't crash into it, although if it's near the house, it will be easier to see these entertaining little birds. Enticing birds to your garden with desirable fruit and seeds will help greatly in controlling insect populations as most birds prefer a varied diet. The importance of insect control by birds can hardly be over-rated. We welcome your feedback.