Open GardensGardens you can visit

A lovely small castle, built 14th - 17th centuries, with a walled fruit, vegetable and ornamentalgarden laid out in the Late Victorian era. Now owned by the National Trust for Scotland. The garden is managed organically and many heritage varieties from Garden Organic's Heritage Seed Library are grown here. Visit in summer for the best colours. Woodland and meadow walks, tearoom, exhibitions and a children's adventure playground add further interest.

A wonderful day out for everyone, spread over more than 300 acres there are a multitude of things to see and do. The gardens are spectacular no matter when in the year you decide to visit. The glass houses and ornamental gardens are a must and if you aren't too scared of heights the new Treetop Walkway allows you to get a unique view. If you do suffer a little vertigo be warned that in windy weather the walkway does move slightly which some may find disturbing.

From my review on trustedplaces.com: http://trustedplaces.com/review/uk/richmond-upon-thames/attraction/1o82j8u/kew-gardens

I agree with Andrew - I love Hidcote and I have been back there several times at different times of the year. Always beautiful. Maybe we could ask them for a GoY private opening, Andrew?

King John’s Garden near Etchingham in East Sussex. Is well worth a visit and I have walked around it several times now. Legend has it that King John II, who became King of France in 1350, was held hostage in this house for some years. King John’s Lodge is a listed Jacobean house surrounded by a 5 acre garden. I love the wild flower garden and the meadow. There are a number of water features including a lily pond and fountain in the formal garden, a wild pond and a secret pond in the woodland area. This secret pond is a meandering pleasure from the gentle waterfall at one end to the hidden dell at the other.
The garden is the mothers domain and indeed one sunny visit she came across the lawn and talked about the garden while the Nursery is the son's, which has some lovely plants and pots on sale.