At this stage earlier concept or sketch ideas are developed into more detailed designs to ensure that they are achievable and will meet the client needs. The design evolves as more surveys (such as Arboricultural, Ecological etc) are available and other disciplines (such as Architects, Engineers etc) develop their elements which feed into the overall design process. 
The detailed design stage typically entails providing colour plans, sections, planting schedules, and material palettes with outline specifications.