Olea europaea or the olive trees make great bonsai trees. The olive trees have green and/or black fruits, which are oval-shaped and bitter to the taste. The fruits have pits. When ripe the fruits are black. Olive trees are grown for its olive oil also. Throughout the Mediterranean regions, the olive tree is valued. The tree grows slow. Most growers up bring the olive herbs, training them as bonsai dwarfs. The ornamental trees grown in homes do not produce fruits, yet you can find herbs that grow bonsai olive trees.