Asclepias fascicularis (California Narrow Leaf Milkweed) is a western native species that enhances the landscape with its huge white flower clusters and big, narrow leaves. A host plant for Monarch populations on the West Coast and Great Basin, this ornamental species is easy to grow and thrives in a wide range of growing conditions. Companion plants include other butterfly-attracting native perennials like Achillea, Eriogonum (Sulfur Buckwheat) and Appleblossom Grass (Gaura).