There's also enjoy a bog garden of impressive proportions, which was created in 1977 along both sides of the stream flowing from the lower lake. Later, another dam was built lower down the valley to create a third lake, which is where some Koi are to be found. But all the fish are difficult to spot through the murky water, with the best chance of seeing them being by feeding the numerous ducks. As the birds rush over, the fish surface to snap up the surplus bread.

The original stock of Koi were bought about 25 years ago and have bred in some years, but don't lead pampered lives, being left to forage for themselves, topping up their diet with bread thrown for the ducks by the many regular garden visitors. The lakes have gradually silted up with time so that they are now quite shallow, but access is so restricted for machinery that dredging isn't an option. However, despite the shallow water, the fish are safe from herons, probably because most of the water's edge is planted and prevents them from wading in.

With something to please most gardeners, we enjoyed our tour around the gardens, which, despite being so popular, manage to retain a tranquil atmosphere. There are plenty of seats to encourage you to linger, enjoy the vistas and study the planting schemes - and there are plenty of ideas to take home; plants too, on sale in the plant centre.