The Matilija poppy is a very large species of California poppy. Its flowers alone can grow to 7 inches in diameter. The shrub itself can be 6-10 feet tall and 2-4 feet wide. Plant near other shrubs that can outcompete it for space, such as Ceanothus, Coffeeberry, Sugarbush, or Flannel bush. Plant in full sun with well-drained soil and water regularly until established. Once established, the shrub is easy to grow and requires no watering at all. Semi-dormant in late summer if grown dry. Can be cut back hard in late fall.  Can be cut back hard in late fall.