Ellen and C.L. talk about how often plants need fertilizer, and several flowering vines  you should know and grow. They review a product that treats poison ivy and poison oak and Ellen explains the difference between elderberry shrubs. :38   True or False:    I need to fertilize all my gardens every year, right? 8:43    Eat/Drink/Grow:  Flowering Vines   17:37  Product Review:  Zanfel for Poison Ivy/Poison Oak 20:51  Love Letters and Questions   From one of the attendees of the Northweest Flower and Garden show: What’s the difference between the blue and purple elderberry flowers?