This and another 2 plants will be released in v5.3.1 and yes, all premiums. https://plus.google.com/ ErnestoAguirreMaldonado/posts/Zt7uqmGHiLp
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This page lists upcoming content for Plants vs. Zombies 2. Please note that things change over...
My guess is that Parsnip is for Food Fight, or Thanksgiving.
Oh look. Even MORE plants for us to pay for.