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Partner Garden
Free access for RHS members at selected times

Grampound Road
Near Truro

A390 between Probus & Grampound.

30 acres

01726 883647

Visit website

Opening Hours

10am–4.30pm, 1 Mar–30 Sep, gardens and tea room. Please see website for house opening dates.


Please see website for admission prices.

RHS members

Free access (member 1 only for joint memberships) applies Jun.


  • Accessible facilities
  • Accessible garden
  • Baby changing facilities
  • Dogs welcome
  • Free carer entry
  • Gift shop
  • Group rates
  • Parking
  • Picnic area
  • Plant sales
  • Refreshments
  • Toilets


  • Champion trees
  • Herbaceous border
  • Sculpture
  • Woodland

About the garden

Owned by
Sam Galsworthy

Trewithen means 'house of the trees', and the name truly describes this early Georgian house in its wood and parkland setting. The 30-acre garden is an International Camellia Society Garden of Excellence (one of only five in the UK) and is also renowned for its rhododendrons, magnolias and champion trees.    

Originally in the Hawkins family, it was when George Johnstone (a nephew) inherited Trewithen in 1904 that the gardens were developed into those we find today with the serpentine South Lawn especially being accredited to him.    

Many of Trewithen's trees and shrubs were raised from seed collected in the wild. Johnstone helped finance some of the expeditions to China, and specimens were also introduced into the garden from Asia, North and South America and Australasia. Many of these have been found to grow taller and wider than in the wild.    

In particular is Camellia x williamsii 'Donation' a cutting, which was given to Johnstone and now all 'Donations' worldwide stem from the plant at Trewithen, as the original plant at Borde Hill in Sussex died before being further propagated.

Plants of special interest

  • Agapanthus
  • Camellias
  • Conifers
  • Cyclamen
  • Daffodils
  • Ferns
  • Hellebores
  • Magnolias
  • Rhododendrons/azaleas
  • Shade-loving plants
  • Snowdrops
  • Spring bulbs
  • Wildflowers

Get involved

The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.