Full title: The sunken hull of the City of Adelaide steam ship, burnt in 1912, has become an artificial island hosting a variety of plant and bird life approximately 300 meters (330 yd) off the shore of Cockle Bay, Australia
They look like mangroves, which are already a plant that grows directly in salty water.
Edit: yeah they’re mangroves. https://mymodernmet.com/ss-city-adelaide-shipwreck/