[unable to retrieve full-text content]A German gardener broke his own Guinness World Record by growing a sunflower plant measuring 30 feet and 1 inch high. UPI was there: Hans-Peter Schiffer of Karst first held the record for tallest sunflower plant in 2009 with a 26-foot, 4-inch sunflower and he broke his own record in 2012 with a 27-foot plant. …