Pacific Coast Iris 'Clarkes Hill'Pacific Coast Iris 'Clarkes Hill' Bred by Ken Rae here at Spring Park. The Pacific Coast iris plants are a small clump forming perennial plant with strappy grass like foliage that are ideal to plant on borders or grass gardens. They are very tolerant of a wide variety of conditions and will grow in full sun to shady areas they are also tolerant planted at the base of pine trees. They need little attention only once a year when at the start of winter