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Little research is available on green roofs in the harsh New England climate. Performance of 12 plant species and effects of adding soil nutrients were measured on an established green roof in central Massachusetts over two growing seasons, starting when maintenance ended, two years after planting. Sedum hybridum plus ellacombianum maintained about 60% cover where planted and reached 50% cover elsewhere. Other species had 0-10% cover. Volunteer species combined had up to 60% cover, bringing totals to 70-90%. Nutrients had little effect. Low-maintenance green roofs appear feasible in New England, but species should be locally pre-tested. Volunteers may enhance performance.

Plant performance with and without nutrient addition on a low-maintenance green roof in New England