The 125-acre National Trust property in the Wandle Valley has closed its rose garden and cafe and a major cleanup is underway. The garden centre remains open but is difficult to access.
According to the Environment Agency, the River Wandle's catchment area saw 44mm of rain fall over 12 hours last night, with further heavy rain expected this afternoon across London and the South East.
Trees have also been reported down across roads and railways. The London Fire Brigade has received more than 500 calls to its 999 number and has rescued residents from properties in the East of London by boat after the River Rom burst its banks.
Green Party member of the London Assembly Caroline Russell has taken the opportunity to call for more tree planting to help mitigate the effects of future downpours, likely to become more frequent due to climate change.
Writing in today's London Evening Standard Russell called for SuDS measures such as tree pits, as well as river bank and park plantings, and for mature trees to be protected.