Metrosideros excelsa (New Zealand Christmas Tree) - This narrow upright evergreen tree will take full sun and is drought tolerant. Scarlet flowers appear in spring through summer. It can reach up to 20 to 30 feet tall by about 12 to 15 feet wide. It does well in seaside conditions and is hardy to about 25-30 degrees F. Useful for its narrow upright habit. A great street tree. Attracts butterflies and birds.