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Under certain conditions, I know that uncontaminated (e.g. no insects / meat, etc) plant-based foods are prohibited (ie., non-kosher). Examples I can think of include:

  1. Non-kosher wine

  2. Chometz during Pesach and

  3. Plants harvested on the sabbatical/shmita year

What other conditions would render uncontaminated plant-based foods non-kosher?

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Orla? Kilayim? Tevel+? Hekdesh? – Double AA Mar 24 '14 at 6:46
related judaism.stackexchange.com/q/10616/759 – Double AA Mar 24 '14 at 6:49
What if the plant was going to die within 12 months? – Double AA Mar 24 '14 at 19:18

I'm making this a "community wiki" post so others can edit it more easily (and I don't get reputation points for it). Please edit!

  • Tevel.
  • Orla.
  • R'vay, t'ruma, peret, etc., depending on circumstances.
  • Nosar, pigul, lan baazara, etc.
  • Kil'ay hakerem.
  • Tikroves avoda zara.
  • Ir hanidachas.
  • Ashera.
  • Arbaa minim and s'chach and Sukka decorations on Sukos. (S'chach can't be food anyway, but if you wanted to eat it, you couldn't.)
  • Shvi'is after zman habiur
  • Bishul Akum
share|improve this answer
hekdesh, nidrei issur, nazir? – Double AA Mar 24 '14 at 6:52
Arguably, chometz she'avar alav hapesach is not excluded in the question. – Y ez Mar 24 '14 at 19:39

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