PCS (Proefcentrum voor Sierteelt) - PCS Ornamental Plant Research PCS Ornamental Plant Research is active in applied scientific research as well as more practice-oriented research and extension services, located in Destelbergen (B). Important research themes are the optimization of culture methods, growth and flowering regulation, use of energy, quality and post harvest properties of ornamental plants and research for practical utility. Environmental protection has become a very important research theme, including energy management for greenhouses and integrated pest management using beneficial insects. In this context, the PCS developed an observation and warning system for pests and diseases in nursery stock and has also a program for guided control in glasshouse cultures Recently, we also focused on closed culture systems, to ensure zero contamination of fertilizers and pesticides in the environment.