Trove Green Provisions is hosting two flower arranging classes led by Anne Traer, owner of Medford florist Garden and Roads. Both classes will cover seasonal flowers in New England, color theory, and the basics of floral design. The early class class from 5:30 to 7 p.m. will design a compact vase arrangement; cost is $60. The later class, from 7:30 to 9 p.m., will design a fuller and more lush arrangement; cost is $85. Vases and flowers will be provided;…