How can I attract more hummingbirds?

Plant Lantana,cuphera,coneflower,blackened susan,salvia,red flowers,butterfly bush hang up feeders.

Brightly colored flowers... and sugar-water (not that red stuff) into feeders... in a bright sunny spot

Butterfly Bush and Herb BeeBalm both have sweet honey smell and bright attraction

Any flower that has a tubular or trumpet shape keeps them happy. Here in the desert we have aloe, firebush, and agave which is always buzzing with hummingbirds.

The color red is very attractive to hummingbirds but it's important that the flowers produce plenty of nectar. Bleeding hearts, impatiens, petunias, salvias, bee balm, columbine, cannas, viburnums, honeysuckles are some good choices,

If adding more flora isn't an option, you can always add more hummingbird feeders.