Mount Auburn Cemetery’s Horticultural Curator Dennis Collins is the go-to guy for teaching about conifers.  He will use the Arnold Arboretum’s vast collection of conifers to show those that would be suited for smaller spaces in city gardens. Dennis will also recommend plants that can withstand some of the stressors common to urban sites, such as extreme wind or heat.  Dress for the weather and wear comfortable walking shoes for this class, which takes place entirely outdoors.  The location is Bussey Street Gate, Arnold Arboretum, Jamaica Plain.  For directions, and to register, log on to www.wellesley.edu/WCFH, or www.arboretum.harvard.edu, or email horticulture@wellesley.edu.  Cost is $30 for members of WCFH and the Arboretum, $35 for non members. Araucaria heterophylla photo courtesy of Rundstedt B. Rovillos.