This is reflected in the landscape , most clearly seen on Tresco where the lush sub-tropical Tresco Abbey Gardens on the sheltered southern end of the island contrast with the low heather and bare rock sculpted by the wind on the exposed northern end . This is reflected in the landscape , most clearly seen on Tresco where the lush sub-tropical Abbey Gardens on the sheltered southern end of the island contrast with the low heather and bare rock sculpted by the wind on the exposed northern end .