Answer: This is the first I've heard of this practice. I don't know if it's a traditional control measure or a cutting-edge discovery. Rhubarb is high in oxylates, which is what makes it poisonous - perhaps the oxylates kill the bacteria that cause clubroot. In this case, it should not be harmful to your plants. I suggest that you contact Country Journal and ask them for more information about the practice, just to be sure. Other cures for clubroot are crop rotation (plant non-cabbage family crops in that bed for 3-4 years) and improved soil drainage. If you believe your entire garden harbors the disease, grow your cole crops on new soil or in containers to starve the bacterium. Pull any cabbage family weeds (mustards, etc.) that may sprout on the infected ground. Hope this helps!
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