COMMENT:I don't know much about this cacti only what I've learned while owning one.
LIGHT:Plenty of light and sunlight,it loves the sun.
WATER:I water in summer,but please be careful in winter as they are prone to black rot.Even leaving them out in rainy weather is dangerous.
FLOWER:I have heard that it does flower but mine has'nt.What it has got is these beautiful long orange spikes.I love this cacti for its height ( mine is a 1/2 metre) and its huge offsets , which just keep coming.
PROPAGATION:Their offsets come from under the soil and stay connected to the plant.You actually have to tear them away (with roots)from the mother plant.There is another way but this means destroying a mother plant.