Sea Holy or Blue thistle grows in desert coastlines ( dune meadow). There 200 species, Dune meadows is extremely important, as we face climate change. Sea Holly, sea rocket,sea spurge are dune meadows that help dry coastal area stay cool. Sea Holy grows in Namib Desert,

Mexican Thistle is more diverse, it grows in sandy soil, woodland, grasslands, along stream. It can be found in Texas, Arizona, California.

Dune meadows are important to improve pollination and keep pollinators every season.