Evaluating Fertilizer Influence on Overwintering Survival and Growth of Sedum Species in an Autumn-installed Green Roof
Conducted by: Mary Jane Clark and Youbin Zheng
Objective: To determine if fertilizer can increase Sedum plant stress tolerance (e.g. cold and drought)
for an autumn-installed green roof mat system.
Description: In the Canadian climate, when gardens are installed late into the autumn, there is a risk of poor
plant establishment before winter, which can result in winter injury or even plant mortality. This risk is
increased for a green roof system, since the climate experienced by green roof plants is more extreme than gardens
at ground level, due to the exposed location and large day-night temperature fluctuations. A variety of slow release
fertilizer combinations were applied to a Sedum mat green roof system. Plant responses (e.g. leaf colour, plant survival,
growth, percent coverage) were evaluated before and after winter cold stress, and will be evaluated after summer heat
and drought stress.
Overview of the experimental plot in early November (left) and early December (right), 2011. Each box contains a mix of Sedum species and one combination of slow release fertilizer
University of Guelph, Bovey Building,
50 Stone Road East, Guelph, ON, N1G 2W1