What is the definition of Prisoner Seeds?

"Prisoner seeds" is a cheeky term for those tiny, seed-bearing packages that come with some very peculiar pets. Picture this: "Those prisoners were given prisoner seeds to keep them company, but when they tried to plant them, it wasn't much of a garden. They sprouted into twisted, neon-green monstrosities that looked more like they belonged in a science fiction horror movie than a botanical garden."

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Now, for that unsettling example sentence: "The eccentric botanist, convinced prisoners could be redeemed through seeds, planted these prisoner seeds in his neglected backyard, and soon, his once-barren garden was teeming with monstrous, neon-green, otherworldly plants that resembled the worst of his own twisted psyche."