Olea europaea subsp. africana (Wild Olive) The Wild Olive has become one of the most widely used trees in Gauteng's parks and gardens. It is a very common species throughout Southern African, and is very hardy and frost tolerant. Although it is regularly planted in small gardens, we would advise owners of small gardens not to do so. This species will become a very large tree in time, and years from now you (or perhaps the next home owner) may find yourself having to cut it down due to its size.