In the late-19th century the grounds were laid out in typical Victorian style, with a walled kitchen garden, conifers and shrubberies. Other features included a fountain and a possible Japanese garden.
The 1st edition Ordnance Survey map shows three parallel ranges of buildings with a 'fountain' running the whole width of the largest building. The grounds are laid out in Victorian style, with a walled kitchen garden, conifers and shrubberies.
Jill Wrighton of the Garden History Society mentioned a possible Japanese garden on a scarpment many years ago. The map shows a terrace south of the house running north to south, with a tank to its east and outbuildings to the west.
The current status of these gardens features is not known.
In 1296, Walter atte Knoll was a member of the jury which assessed the parish for Edward I's taxes.
The house was sold in 1803 to Major General Alexander Beaton, who wrote about and practised new methods of agriculture at Knowle. He was the Govenor of St. Helena from 1808 to 1813.
The antiquarian, Sheffield Grace owned Knowle House in the mid-19th-century.
The gardens were further developed in the 1930s by Colonel and Mrs Benskin, who also added a new wing to the house.
Sussex Gardens Trust