In 1890, Hartland located an old species now known as 'Ard Cairn Russet', a late keeping apple, and sent samples to the Royal Horticultural Society. He also collected tulips from Irish gardens and introduced the 'Mrs. Moon' variety. Outside of gardening, Hartland is known for producing a colourful tourist guide after a trip to the west of Ireland. He is also remembered by the naming of the Hartland's Avenue/Road area of Cork City in Lough Parish, the location of one of his nurseries.