We have the 30 oz. glass feeders, with little yellow flower at each hole. We have 4 feeders and go through 25 lbs of sugar every two weeks. We have to buy it at costco. Somedays we feed 50+ hummingbirds at a time, waiting in line for a hole. We are considered a feeding station. We have hummingbird plants too, just in case we go on vacation and aren't here to keep the feeders full. We have 5 different kinds. Annas, and Costas we have year round. Usually the Black Chin, Rufus and Allens, come through spring and fall.