Determining Optimal Growing Substrate pH for Sedum Plants
Conducted by: Mary Jane Clark and Youbin Zheng
Objective: To evaluate the growth responses of common Sedum species to growing substrate
pH, in order to recommend optimal substrate pH for green roof systems.
Description: Plant nutrition is import in producing healthy green roof plants, and ensuring
plant survival after installation. In addition to the lack of general knowledge of green roof
plant fertility requirements, more specific topics, such as the influence of substrate pH on
plant growth, remains unexamined especially for species such as Sedum. Soil pH affects nutrient
availability and ultimately plant performance. Five commonly-used Sedum species were grown in
a green roof substrate ranging in pH levels. Plant performance was evaluated to determine the
optimal substrate pH for these species.
Sedum species grown in a green roof substrate, ranging in pH levels, in a greenhouse at the University of Guelph
University of Guelph, Bovey Building,
50 Stone Road East, Guelph, ON, N1G 2W1