big echinocactus flowering plant in a greenhouse

angiosperms beautiful beauty bloom botanical botany buds cactaceae cacteae cactoideae cactus caryophyllales closeup core cultivate cultivation dehydration detail echinocactus eudicots flora floral flower flowering flowerpot flowers garden gardening green greenhouse growing growth horticulture hot leaf lighting natural nature petals plant potted prickly red sharp spiny stinging stones succulent theme thorn thorny tropical