Arduaine Garden (NM 798 105) has a large collection of exotic ferns growing outside, and quite a few natives too. There is also a conservatory with several tender ferns and tree ferns.
There is a charge for non-members of NTS: £6.00 (£5.00 for seniors).
BYO packed lunch or eat lunch at the Chartroom 2 Bistro at Loch Melfort Hotel