If your cactus is blooming, you may be wondering if you should cut off the flower. The answer depends on what you want to achieve with your plant. If you are growing your cactus for its flowers, then you will want to leave the bloom on. However, if you are growing your cactus for its shape or size, then it is fine to remove the flower. Keep in mind that removing the flower will not affect the health of your cactus, but it may prevent future blooming.