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Considerations around wind comfort and safety are important for urban planning and both wind tunnel experiments and CFD are used to predict windiness in the public realm. Landscaping is a common wind mitigation measure because of its additional benefit in improving the streetscape. However, there is a challenge involved in the accurate modelling of the tree properties. This paper illustrates two applications of tree modelling in CFD. A validation study is used to explore the sensitivity to foliage density and drag coefficient. A case study is then carried out to evaluate the impact of foliage density and turbulence.