BY CAROLINE SELLE — The Sixth Annual Hyattsville Horticultural Society Seed Sale took place on Feb. 7 at the Hyattsville Municipal Building.  Organizers said there was a great selection of seeds from Hart and Landreth Heirloom seed companies.  Several educational displays were to be set up on topics including butterflies, beneficial insects, container gardens and favorite seed selections.  Attendees could also shop baked goods, soups, coffee, teas and juices, as well as browse used gardening books.