Child initiated role play opportunities

How can I make an adult directed role play 'garden centre' into a child initiated environment?
Although my question is specific, it relates to any role play theme - so the answer to my question will enable me to become a more skilled and dynamic practitioner - who can utilise the role play area effectively and help me to develop actions that will make a difference to learning and development of the children. There is a huge emphasis on creativity, nationally and within our own school plan. At present I feel confident and able to effectively deliver the EYFS objectives and teach with a thematic and creative approach - but find it a challenge to maintain balance when providing children with child-initiated play opportunities in the role play area. I feel I will learn a great deal by working with Dan Lea (AST) and look forward to him coming into the setting to offer advice and guidance. I understand that child initiated play is integral to the development of young children and value it's importance within the curriculum. By researching my chosen question I hope to develop as an Early Years teacher and feel confident that my skills will impact upon learning.