The sugar is actually for the people, not the cactus! It's a little joke to say that you'll be eating too much sugar on Christmas, and the cactus is a symbol of how the holidays can be a bit hectic at times. It's just a fun way to acknowledge the chaos that can come with the holidays! But the cactus itself is a perfectly fine plant to have around, and it can be a lovely addition to your home. It's just not something that requires any extra sugar or care.