University of Maine Cooperative Extension will offer a webinar for home gardeners about effective houseplant care on March 4, noon–1:15 p.m. “How Not to Kill Your Houseplants” includes tips for matching a potting medium, watering, lighting, containers, pest control and humidity to a plant’s needs. Karen Ramsey, owner of Ledgewood Gardens Greenhouses in Orrington, will read more UMaine Extension to host “How Not to Kill Your Houseplants” webinar March 4