Tidying the 300-year-old, 40ft-tall, 150ft-wide hedge is a two-man job that takes 12 days.
The clippings – this year amounting to nearly a ton – are used to produce a life-saving cancer drug called taxol.
You can visit and see for yourself – the public are welcome every day of the year at the estate and entry is free.
There are even holiday cottages on the property if you fancy a longer stay. And if you book a week in early September, chances are you'll see the hedge-cutting for yourself.
Why you should trim your hedge this weekend
Is now the time for a short back and sides?
Hedgelaying: getting started
We tell you how to get started in the fascinating art of hedgelaying
How to plant a hedge
Alan Titchmarsh talks about the wonders of hedges.
Top tips for topiary
Topiary lifts seasonal gloom and gives the garden a clean, solid framework.
-
How many puppies in the average litter? Country Life Quiz of the DayPlus a 1960s house, Hollywood's most famous cavewoman and more in Friday's quiz.
-
Love, sex and death: Our near-universal obsession with the roseNo flower is more entwined with myth, religion, politics and the human form than the humble rose — and now there's a new coffee table book celebrating them in all of their glory.
-
An expert guide to growing plants from seedAll you need to grow your own plants from seed is a pot, some compost, water and a sheltered place.
-
The best rhododendron and azalea gardens in BritainIt's the time of year when rhododendrons, azaleas, magnolias and many more spring favourites are starting to light up the gardens of the nation. Here are the best places to go to enjoy them at their finest.
-
Great Comp: The blissful garden flooded with rhododendrons and azaleas that's just beyond the M25Each spring, Great Comp Garden — just outside the M25, near Sevenoaks — erupts into bloom, with swathes of magnolias, azaleas and rhododendrons. Charles Quest-Ritson looks at what has become one of the finest gardens to visit in Kent.
-
'I'm the expert who wrote the RHS's guide to roses — here's why pruning them right now is almost certainly a terrible mistake'More roses die from over-pruning than any other cause so what’s the reasoning underpinning this horticultural habit? Charles Quest-Ritson, the garden expert who wrote the RHS Encyclopedia of Roses, takes a closer look.
-
Forsythia: The spring flower that's a ray of sunshine — and a foolproof option for novice gardenersForsythia are often sniffed at for being too brassy, but there is a lot more going for them, says Charles Quest-Ritson, although don’t plant them next to clashing pink-flowering currants.
-
John Morley: A brush with the artist who changed the world of snowdropsTilly Ware meets the artist and galanthophile John Morley in his Suffolk garden, home to the oldest snowdrop nursery in the country.
-
Alan Titchmarsh: I went a bit mad ordering bulbs — and I'm not even a little bit sorry I didOur columnist's splurge in the autumn is now paying off with spectacular irises across his garden.
-
Dawn Chorus: How to travel around the world in 19 flowers and the Mini Moke that took St Moritz by stormWhat do Charles Dickens, Henry VIII and Ellen Willmott all have in common? They all appear in a new book chronicling 19 flowers and the people responsible for bringing them to the UK. Find out how to get your hands on it, plus, we reveal why a rare Beach Boys-inspired Mini Moke turned up in a Swiss ski resort and a few of India Knight’s favourite things.
