The latest short-lasting flowering of our beautiful echinopsis seminudus flowers attracted the usual large numbers of bees. How they discover these fragrant flowers, so quickly, is a mystery. The flowers start to close within an hour of the bees leaving & these ones were fully closed by 11am.
Another mystery is why these plants need to attract pollinators, at all, as they do not set seed. They use a huge amount of energy in growing these flowers, which are larger than the plants, & their equally big stems. The interior of the large flower stem is reabsorbed by the plant. When it is completely withered up, it drops off & there is absolutely no sign of there ever having been a flower.