WESTOVER House, Calbourne, is opening its garden of more than nine acres on Sunday between 2pm and 4.30pm.
Highlights include a wooded dell, orchard, lake, perennial borders and walled kitchen garden.
Visitors can walk round the perimeter of the estate through the woods, ending with tea and cake on the lawns. The cost is £4 and parking is free within the grounds. Dogs on leads are welcome.
Mottistone Manor is also holding an open day on Sunday between 9.30am and 4.30pm. There is a charge to the house for non National Trust members. The garden is open as usual.