it is easiest if you do your pruning before the flowers bloom, especially on the ball cactus! once they bloom you end up having to cut off the flowers to get to the dead parts, and then without the flowers it won't sell anyhow!
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Why is it that if someone tells you that there are 1 billion stars in the universe you will believe them,
but if they tell you a wall has wet paint you will have to touch it to be sure?