Up for bid are seeds of Echinocactus setispinus. This great cacti forms small barrel shaped plants that are green and bloom with yellow flowers, and they form offsets to make nice clumps. These plants are extremely exotic, yet they are fairly cold hardy. They are hardy to at least USDA zone 7, and possibly colder. These plants would make excellent additions to your rare plant collection, or just make a unique statement in your yard.
