£55,000 was spent tending the Downing Street rose garden, The Mirror reports.
The sum was spent on plants, flowers and trees for David Cameron's garden over the past five years.
It works out at roughly £27.50 per square metre of Number 10's well groomed back yard.
But the Royal Parks, responsible for the half-acre plot behind the Prime Minister's famous residence, has not disclosed details of staff and other maintenance costs.
The walled garden features an L-shaped lawn, flowerbeds and a pond, as well as a vegetable patch and play area for the Camerons' children.
In 2010-11 £10,843 went on "seasonal bedding", while in 2011-12 the figure was £9,309, in 2012-13 £11,768, in 2013-14 £8,812, and in 2014-15 £6,733. Another £7,339 was spent on shrubs, perennials and trees over the period.
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