Buy the 2015 Old Farmer's Almanac!
Reporting
Some varieties don't bloomSome varieties don't bloom until late summer. Check your seed packet for days to maturity. Most sunflower varieties have a maturity between 75 and 110 days. Also, do not overdo the nitrogen fertilizer because that will delay flowering.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?