The term 'Evergreen Oak' refers to three different species of trees: the HOLM Oak (Quercus ILEX), the ILEX Oak (Quercus ILEX) and the Encina Oak (Quercus encina). The HOLM Oak is a Mediterranean evergreen tree that can reach up to 20 meters in height. The ILEX Oak is a deciduous tree native to Europe, North Africa and western Asia, and can reach up to 15 meters in height. The Encina Oak is an evergreen tree native to the Mediterranean region, and can reach up to 25 meters in height. All three species are known for their longevity and are often used as ornamental trees in gardens and parks.