Pittosporum crassifolium is a small, erect, bushy, evergreen tree or shrub native to New Zealand. It is a very hardy variety of Pittosporum and is suited to coastal conditions. Commonly called Karo, Pittosporum crassifolium has thick leathery leaves that are buff-coloured and feel 'felted' on the underside. It produces red to deep purple, tubular, bell-shaped flowers in early summer, followed by brown seed capsules. Pittosporum crassifolium is being kept under observation in some parts of the USA, to ensure it doesn't escape into the wild. In New Zealand too, it has become a pest plant due to birds spreading the seeds in areas south of its natural range .