Octopuses have their own kind of garden under the sea. Some species of octopuses have been seen picking up shells, rocks, and other objects to create a little garden. They use these gardens as their home and a place to hunt.

PBS article to confirm this fact - https://www.pbs.org/newshour/science/why-nesting-at-octopus-garden-helps-female-octopuses-give-their-young-a-better-shot-at-survival