COBWEB THISTLE  0 in stock Cirsium occidentale plant type: perennial communities: chaparral, grassland, oak woodland average height: 3' in flower average width: 1' light: full sun water: dry attributes: deer resistant, hummingbirds, butterfiles, songbirds From steep slopes in grassland, chaparral, and woodland openings. A stunner: clumps of bold, grey-green thistle leaves topped by several magenta flower heads on tall stalks. Tough to grow as it needs perfect drainage, but if you have the site, well worth a try. Hummingbirds and butterflies love the flowers and birds favor the seeds.