The Horticultural Society of Maryland's 25th Annual Garden Tour, Gardening Just Enough for the City: Roland Park, Guilford and Tuscany-Canterbury features 7 exquisite urban gardens showcases spaces ranging from inventive container, rock and pocket gardens to magnificent backyard retreats filled with roses, rare plants, ponds and charming outdoor art that provide a welcome refuge for reflection, relaxation. The tour is held rain or shine. Free for HSM members. Purchase tickets at website.