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Who we are


Photo of Dr. Youbin Zheng

Dr. Youbin Zheng, Ph.D., MPhil., MSc., BSc.
Associate Professor, Environmental Horticulture Chair,
University of Guelph/Vineland Research and Innovation Centre

Dr. Zheng is the program lead. He has more than 20 years experience in horticulture research, specifically in greenhouse and nursery plant production, green infrastructure (e.g. green roof), and urban agriculture. Dr. Zheng’s research interests include irrigation water treatment, irrigation technologies for water use efficiency and plant health, soil science, growing substrates, plant nutrition and fertilization, supplemental lighting, plant physiology, and plant-environment interactions.

For more information about Dr. Zheng's research, please click: www.ces.uoguelph.ca/team-youbin.shtml
www.ces.uoguelph.ca/greenroof/

Photo of David Llewellyn David Llewellyn, M.Sc. Hort.

David has been working in the horticulture industry for the past 20 years with broad experience including: field vegetables, nursery crops, landscaping, tender fruits, woodlot management, and greenhouse production (floriculture and vegetable). Since coming to Guelph in 1997 to do his M. Sc., he has specialized in controlled environment horticulture research including: various aspects of greenhouse production and management and engineered interior landscapes for improving air quality in occupied spaces (i.e. botanical biofiltration of indoor air). Mr. Llewellyn is currently involved in research aimed at characterizing and optimizing aspects of the greenhouse environment including: lighting and irrigation water use and treatment (eg. ozonation, UV, biological remediation). His aim is to serve the greenhouse industry by performing grower-relevant research that will improve production efficiency while reducing the industry’s environmental footprint.

Photo of Yun Kong Yun Kong, Ph.D., Horticulturist

Dr. Kong is specialized in the following areas:

  • Using plants to remove Na, Cl from nutrient solution
  • Horticultural crop cultivation
  • Environmental physiology of horticultural crops
  • Environmental control for horticultural crops

Photo of Katherine Vinson Katie Vinson, Research Technician

Ms. Vinson is specialized in the following areas:

  • Plant biology
  • Plant maintenance
  • Horticulture
  • Water analysis

Katie has been a part of the School of Environmental Sciences since 2010 and has worked on a variety of horticultural research studies, for example, those involving green roofs, fertilizers, growing substrates, and irrigation systems. Some of the irrigation work has revolved around maintaining ideal pH levels in the irrigation systems at nursery production sites. Her goals are to provide nursery growers, greenhouse growers, and others in the horticulture industry with guidelines to improve production efficiency, reduce costs, and become more environmentally-friendly.

Photo of Siobhan Dunets Siobhan Dunets, MSc candidate

Siobhan is a M.Sc. candidate focusing on treatment of process water and wastewater for the greenhouse and nursery industries. While completing her B.Sc. in Earth and Atmospheric Science, Siobhan focused on soil science and developed a solid background in this subject. Throughout her university career she has assisted with a number of projects covering topics such as green roofs, mycorrhizal fungi, and butterfly reintroduction. She has since branched out to water treatment technology for the greenhouse and nursery industries, and through her work on this website she has gained a solid introduction to this subject. Siobhan hopes to apply her interest in soil/substrate science and water treatment to future endeavours in the area of sustainable and efficient plant production.

Photo of Eric Rozema Eric Rozema, BSc

Eric received his B.Sc. Env. from the University of Guelph in 2012. Throughout his undergrad he took courses that focused on the movement of chemicals through the environment, ecology, and water and soil sciences. He is now working on his Masters at the University of Guelph with Dr. Zheng and his research is focused on constructed wetlands for wastewater treatment, specifically plant selection to maximize treatment efficiency. Eric grew up working part time jobs at greenhouses and building constructed wetlands for water treatment, and he has a special interest in the industry.


This work was supported in part by the Canadian Ornamental Horticulture Research and Innovation Cluster and Canadian Ornamental Horticulture Alliance

For more infomation please contact Dr. Zheng (yzheng@uoguelph.ca)

link to CESRF website