Blue--arguably the most elusive color in gardening. If you’ve ever bought a plant that touted “beautiful blue blooms” only to discover that when it flowered it was actually purple, you are not alone. Or, perhaps you’ve drooled for years over pictures of Himalayan blue poppies, the truest of blue flowers, and one of the most difficult plants to cultivate successfully. Well, Steve and Danielle to the rescue. In this episode the pair discuss awesome plants with blue blooms (or at least Danielle does—turns out Steve is a bit color-challenged). The topic was so inspiring, there was even some signing. We apologize for that in advance.   Expert testimony: Dan Robarts,  horticulturist and propagator at Coastal Maine Botanic Gardens in Boothbay.