Rick Peterson manages the Great Plant Picks educational program at the Elisabeth Miller Botanical Garden in Seattle, Washington. His home garden in Federal Way, which he shares with frequent Pacific Horticulture contributor Richie Steffen, is landscaped with “restrained exuberance” and includes overly abundant collections of species rhododendrons, iris, epimedium, ferns, and a plethora of other rare and unusual flora. Both plead guilty to the current menagerie of potted plants waiting patiently in the driveway…