The annual Perennial and House Plant Sale, organized by the Somerville Garden Club, will be on Saturday, September 15 from 9 am to 1 pm. Look for the hundreds of plants for sale in the heart of Davis Square at the intersection of College Ave. and Holland St., across from the Somerville Theater. Garden Club members and friends of the club have donated perennials for sun and shade, plus trees, shrubs, herbs and other edibles, all ready to be added to your home landscape. And for the strictly indoor gardener there will be a wide selection of house plants perfect for your living room or dorm room. Horticultural books, tools, and garden dÃ©cor will also be for sale. Garden club members will be available to answer questions and assist with choosing the right plant for your growing conditions. Proceeds benefit the non-profit Somerville Garden Club and support its citywide public plantings, free lectures, and in-club scholarship program.