Some of the gardens around Barrhill that are well worth a visit:
Castle Kennedy, Glenwhan, Ardwell Gardens, Logan Gardens.
Rather than describe them here the links to their own websites are given below.
http://www.glenwhangardens.co.uk/
http://www.scotlandsgardenroute.co.uk/gardens/ardwell-gardens
http://www.rbge.org.uk/the-gardens/logan