Rapid urbanisation and environmental degradation draw increasing attention to the delivery of ecosystem services that plants provide in cities, this entails in particular questions concerning advanced utilization of the performance of Urban Green Systems (UGS). Future urban green systems (UGS) can mitigate the consequences of urban climate change by improving outdoor living quality and protecting buildings and people from the consequences of extreme weather. The design, planning, and management of novel UGS can adapt strategies and methods from historical land use systems. These systems have been developed specifically for certain contexts with the aim of achieving precisely defined functions. They are based on a set of techniques such as coppicing, pollarding, pleaching or grafting. The potential of these practices for the development of novel UGS has not yet been systematically assessed. How can the structure and microclimatic effects of such plant systems be captured and calculated? How can the reactions of plants to manipulation techniques be simulated? How can design and maintenance decisions be structured by comparison between the actual and the intended status? Are these methods feasible for short and long-term forecasts of the development and are they suitable for the design and management of novel UGS? The research aim is to tackle the complex dynamics of UGS design and plant growth management through a novel combination of performance-oriented design, 3D-scanning, and simulation. The aim is to set out a framework for a novel workflow, coupling generative and analytical computational methods, and related tools, with an adequate decision support system. This workflow will be derived from two historic systems: house-protection hedges (Hausschutzhecken) and trained tree canopies. Historically, the emergence and development of these systems is based on a regular comparison between the actual development and the targeted performance. This procedure integrates design decisions, physical plant manipulations and growth processes. the project combines different methods, interdisciplinary expertise and prerequisite experience in three closely related and complementary research areas: living tree architecture (Baubotanik; F. Ludwig), computational design (M. U. Hensel) and urban forestry (T. Rötzer, H. Pretzsch).The development of computational design framework, method and workflow for utilizing advanced performative capacities novel UGS is highly original and innovative. Coupling such an advanced workflow with decision support enables new broad interdisciplinary applications across planning and design of UGS.