My blueberry bushes are not flowering (or producing fruit). The first one was planted spring ’07, (1′ high). The second two were planted fall ’07. The first one has hardly grown. The second two have grown a bit. They look healthy but some of their leaves are turning rusty red, as if getting their colors for fall. Are they too young to produce fruit? Or what else could be up with them and what should I do to help them flower next year?