I would guess that there is no danger from the soil- but I don’t know for sure… I believe the toxic substance (ricin) is manufactured by the plant as an insecticide rather than an herbicide. The toxins produced to inhibit plant growth (allelopathy) are those that end up in the soil.
I have grown castor bean in the ground in multiple years with other plants beside it, and never seen any lasting effects.
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Welcome! I’m Margaret Roach, a leading garden writer for 25 years—at ‘Martha Stewart Living,’ ‘Newsday,’ and in three books. I host a public-radio podcast; I also lecture, plus hold tours at my 2.3-acre Hudson Valley (NY) Zone 5B garden, and always say no to chemicals and yes to great plants.