composting Castor bean

Discussion in 'HortForum' started by kevind76, Oct 31, 2010.

  1. kevind76

    kevind76 Active Member

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    Can Castor bean plants be composted? Is the entire plant poisonous? Is it okay if the compost is not used for plants that will be eaten?
     
  2. saltcedar

    saltcedar Rising Contributor 10 Years

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  3. kevind76

    kevind76 Active Member

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    Interesting. Thanks. Is this also true of Rhubarb, then?
     
  4. saltcedar

    saltcedar Rising Contributor 10 Years

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    I see no reason it should be different.
     
  5. kevind76

    kevind76 Active Member

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    I've always been told to never put Rhubarb leaves in vegetable garden compost, since they are toxic. Not an issue, then, I guess?
     
  6. saltcedar

    saltcedar Rising Contributor 10 Years

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    The oxalic acid is in many foods such as spinach.

    http://oxalicacidinfo.com/

    http://en.wikipedia.org/wiki/Rhubarb

    Toxic effects
    "Rhubarb leaves contain poisonous substances, including oxalic acid which is a nephrotoxic and corrosive acid that is present in many plants. The LD50 (median lethal dose) for pure oxalic acid in rats is about 375 mg/kg body weight,[15] or about 25 grams for a 65 kg (~140 lb) human. While the oxalic acid content of rhubarb leaves can vary, a typical value is about 0.5%,[16] so a rather unlikely 5 kg of the extremely sour leaves would have to be consumed to reach an LD50 of oxalic acid."
     

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