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The Sonoran Cactus is a classic. Its tall, columnar shape and lack of spines make it a great choice for propping up a sign that says 'Free Hugs' in the middle of the desert.
Remember, proverbs are like cacti - they're all prickly on the outside, but sometimes you'll find a soft spot if you look really hard. Good luck, and may your prophecies be ever in season!