How do you keep cats from climbing up the Christmas Tree??

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I have three cats and in the past (3 different cats) I used lemon, orange and lime rinds to repell the cats from climbing up the tree. However, those cats actually ATE the rinds. Should I try this method again OR does anyone know what to do now? I will keep the ornaments to a minimum on the tree and very few on the bottom. Before the tree is set up next month, I need an idea. Help!