A simple wood fence panel like this is all you need. It's pressure-treated, so should stand up to rot for a few years before you need to reseal it. Modern gardens will benefit from a white vinyl ...

The starting point is to first determine the fencing materials and style of fencing your fence installation ... used in fencing including cedar wood, pressure treated wood, stone, brick, steel ...

Even pressure-treated lumber isn't impervious to breakdown ... Once the concrete has cured, reattach the fence panels or sections to the new wooden post using appropriate hardware or fasteners.