Olive tree Olea europeana including Elho decorative pot, greyA complete picture. The olive tree has greyish leaves with a decorative stem. The grey decorative pot completes the picture! The olive tree (Olea europeana) adds a Mediterranean touch to your garden, balcony or patio. After a few years, olives hang off the tree. However, these are more for appearance than for consumption. Remove the plant from the nursery pot and place it in the decorative pot. Then fill the decorative pot with earth. This gives the