Buy the 2015 Old Farmer's Almanac!
Reporting
Yes, it's normal for lowerYes, it's normal for lower leaves to die as the plant puts energy into growing. Make sure your sunflowers aren't being watered too much or having drainage issues.

2015 Garden Calendar2015 Weather Watcher's Calendar2015 Recipes Calendar2015 Engagement Calendar 2015 Everyday Calendar2015 Country CalendarNew Year Cross StitchLobster Rope Doormats