white flower blooming on top gymnocalycium cactus in pot

background beautiful bit bloom blooming blossom botanical botany brown cactaceae cacti cactus chiang closeup color colorful decoration desert dessert detail dry flora flower fresh garden green grow growth grunge gymnocalycium haselbergii lobivia mamillaria mammillaria metal mexico natural nature nivosa old parodia photography plant plants pot rai rustic sharp spine succulent summer sweet take texture thailand thorn top tropical white