barrel cactus (echinocactus grusonii) growing among pebbles : (pix sanjiv shukla)

echinocactus grusonii golden barrel cactus ball mother- -law#39aph39#s cushion cacti family cactaceae subfamily cactoideae endemic mexico rare endangered wild volcanic rock slopes large spherical globe ribs knobbly appearance spines small yellow flowers summer crown plant cultivated plant nurseries ornamental containers desert habitat gardens rock conservatories white-spine form short-spine cultivation popular architectural accent contemporary garden designs fast growing warmer climate good drainage watering plants botanical deserts north america