Marcia Davis: Will early-blooming flowers attract early hummers?
21.05.12
Will ruby-throated hummingbirds arrive early this spring? If they do they'll find an abundance of early-blooming flowers and unseasonably warm temperatures.
April 1 is my usual target date to put out the hummingbird feeders. However, I often don't see my first hummer before April 10. I put my feeders out five days early this year to be prepared for any early hummers.
Besides sugar water in a feeder (the standard mixture is 1 cup table sugar dissolved in 4 cups water) hummers will find nectar-bearing flowers in my yard. Some of my favorite hummingbird plants, like autumn sage and crossvine, are blooming earlier than I can ever remember. A patch of native columbine in full bloom is having its best spring ever.
Northward advancement of migrating ruby-throats depends on the availability of nectar-bearing flowers and small insects for food. Food availability depends somewhat on temperature. Hummers usually don't move north until temperatures rise above 35 degrees in any specific region. As temperatures rise, important native hummingbird plants like dwarf red buckeye trees and wild columbine come into flower and provide fuel in the form of nectar. The flowers attract many small insects that are eaten by hummingbirds. Nectar and insects are the fuel for migration.
Source: Knoxville News Sentinel