``There is the question of whether pruning the trees may have prevented the fall from happening,'' she said.
Ms Wilson was living in London where she worked as an accounts manager.
John McLinden QC, representing her family, said the gardens may not have had a policy to deal with the dangers of summer branch drop.
``Kew recognised the danger of summer branch drop and the implementation of it did not occur.
``Did Kew ever warn members of the public of summer branch drop and did they cease those warning? Did they take precautions by cordoning off areas and did they cease doing that as well?''
If the cause of the incident was summer branch drop, the gardens would need to take further measures to protect the public, he said.
Speaking outside court, Miss Wilson's uncle, Pieter van Vliet, told the Mail the family wanted the issue of summer branch drop to be explored during the inquest to prevent further deaths.
``We're not experts but obviously Kew Gardens has trees, a lot of them, so potentially there is a good reason for bringing this up,'' he said.
The hearing continues.