I like plants, but then I decided to turn over a new leaf and branch out.
Turn Over A New Leaf
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Explanation
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Explain Bear
Listen up, genius. This joke is punny. The dude likes plants, see? But then he wants to "turn over a new leaf" which means he wants to change his life. And "branch out" which means he wants to try new things. But it's also about plants, because leaves and branches are parts of plants! You wouldn't know, would you?