Long Island’s South Fork, known for beaches, maritime history, and fancy people, is also known for its hedges. Hedge installation and maintenance are big business, and there could be a whole book about hedges, with different varieties popular during different eras. In the last decade, for example, the “green giant,” a now ubiquitous tree, has been placed along property lines throughout the Hamptons. It’s here to stay, and grow, and grow.