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The propagation won't spread the glow-in-the-dark, so why wouldn't they?

The Firefly petunias retain their glow with propagation. Cloning via a cutting is the easiest and most reliable way.

The seeds are hit-or-miss, but the genes definitely get passed on in some.

Why wouldn't propagation create further glowing plants, they're genetically modified?

Because I mistakenly thought the comment was referring to the plants that are the subject of the article, which aren't genetically modified.