Casuarina Glauca "Cousin It" Cousin It is a groundcover form of the tough, hardy Australian native sheoak. It bears bright green foliage which forms a thick mat cascading over retaining walls or rocks. Cousin It can handle most soil types and a range of conditions, however, it prefers a sunny to partly shaded position with well-drained soil. This native is tolerant of dry and coastal conditions. Requires low maintenance and water once established. 6" pot size.