close-up of top of a kroenleinia grusonii or golden barrel cactus

arid cactaceae cacti cactus close-up desert drought resistant garden dry echinocactus grusonii fluted gardening golden ball barrel green kroenleinia mexico mother- -law#39aph39#s cushion nature ornamental plant prickly ribbed rock round sharp spike spines spiny stem succulent thorn top yellow scene sydney australia native cultivated