Cactus flower’s petals open up when it is sunny and close back up when it is cloudy or dark outside. Cactuses will only bloom (visible Cactus Flowers) if they get enough water, heat or after a certain age. If a cactus blooms, parts that have been growing underground for many years suddenly sprout into a stalk with buds and then finally flowers on top.
As if these cactus flowers weren’t gorgeous enough just to look it, watching them open is amazing!