Pittosporum Tenuifolium Silver Ball Large in 20 Litre pots: Pittosporum Silver Ball a relatively new cultivar. Silvery grey-green variegated, forming a dense natural ball shape. Perfect for adding some evergreen structure throughout the winter months. Easy to grow, it looks great grown in the border but owing to its dense, compact habit, equally suited to be grown in containers and can be clipped easily to maintain the size and shape desired.