Behind the walls of a historic estate near Darlington lies one of County Durham's best-kept gardening secrets.
Thornton Hall Gardens opens for only a handful of days each summer, making every visit a prized chance for gardeners and plant lovers.
Today, the gardens are famed for their sweeping borders, colourful planting and tranquil ponds. Less than 40 years ago, they looked very different.
When Mike and Sue Manners moved to Thornton Hall in 1989, its three walled gardens were little more than paddocks for cattle and sheep.
Mike and Sue Manners. (Image: STUART BOULTON)
It was not until the summer of 1995 that the transformation began.
Sue wanted a safe place for her children to play away from livestock, so she reclaimed one paddock and turned it into a garden.
With no formal gardening experience, she stripped the grass by hand and planted narrow borders with seedlings she had grown herself.
Thornton Hall and Gardens open day 2026. (Image: STUART BOULTON)
What started as a practical family project quickly became a passion.
Sue expanded the gardens over the years, adding plants from local nurseries and new borders whenever time and money allowed.
The gardens changed dramatically in 1999, when Sue added an ornamental pond, stream and waterfall.
Thornton Hall and Gardens open day 2026. (Image: STUART BOULTON)
The water features transformed the garden and encouraged Sue to dream bigger.
Sue said: "There was never any great master plan.
"The gardens just evolved and continue to evolve year on year.
"Nothing stays the same."
From left, Rosemary Rock, Helen Atkinson and Isobel Sanderson. (Image: STUART BOULTON)
As plants outgrew their original positions, Sue created a second garden in 2000 for larger drifts of flowers and bolder combinations.
Sue added a wildlife pond in 2002, where a pair of call ducks helped control slugs.
Thornton Hall and Gardens open day 2026. (Image: STUART BOULTON)
In three decades, the gardens have become a plantsman’s paradise.
Visitors can explore winding borders filled with roses, clematis, delphiniums, peonies, hostas and heucheras, plus unusual shrubs, mature trees, sculptures and secluded seats.
Gillian Gardner shelters from the sun at Thornton Hall and Gardens open day 2026. (Image: STUART BOULTON)
Thornton Hall and Gardens open day 2026. (Image: STUART BOULTON)
A productive vegetable garden followed in 2009, while every section is designed to maximise colour, texture, fragrance and seasonal interest.
The result is a striking contrast to the estate's agricultural roots.
Thornton Hall & Gardens 2025. (Image: SARAH CALDECOTT)
Thornton Hall is still a working farm, with the gardens occupying just one part of the historic estate.
The estate’s history stretches back centuries. Records show that after the window tax was introduced in 1696, many hall windows were blocked up and the walled gardens became orchards again.
Thornton Hall & Gardens 2025. (Image: SARAH CALDECOTT)
Despite their beauty, the gardens remain largely off-limits to the public.
In 2026, the gardens opened just nine times between May and July, including a May plant fair and Wednesday openings in June and July.
Thornton Hall & Gardens 2025. (Image: SARAH CALDECOTT)
Thornton Hall & Gardens 2023. (Image: SARAH CALDECOTT)
The limited access has helped build the gardens’ reputation, with many visitors returning each year to see the planting evolve.
Thornton Hall & Gardens 2023. (Image: SARAH CALDECOTT)
Davina Lovegreen Catering is an outside catering business which provides food at the open days.
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They use the meat from the farm, making the sausages, bacon, and burgers on site which is available from the fast food unit.
They also offer a selection of sandwiches, cakes, soup, and salads as well as traditional freshly baked scones and cakes.
For visitors who make it through the gates, Thornton Hall Gardens is a hidden oasis that has grown from a sheep paddock into one of the Darlington area’s finest private gardens.