deadly plants

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Across
  1. 1. (plural) mushroom, like truffles for example
  2. 4. plural forms of cactus
  3. 5. stop beating about the ... and be straight with me
  4. 7. part of the plant that is its "backbone"
  5. 8. what Socrates was poisoned with
  6. 10. native
  7. 11. poisonous
  8. 12. to suppress something when it only starts: nip it in the ...
Down
  1. 2. hard to detect
  2. 3. a very clever and innovative idea
  3. 4. very quiet or relaxed
  4. 6. what you sow to grow a new plant
  5. 9. part of the plant that people and animals often eat