Nibbles: Rhubarb and the EU, Mexican biodiversity Qat in Yemen, Organic cubed

Rhubarb safe at long last. Rejoice! The BBC does, sort of.
Biodiversidad Mexicana website lists plants with centres of origin/diversity in that country, with references.
Sometimes agrobiodiversity is downright bad for you.
And here’s today’s story on the “organic” urban vegetable gardens of Havana.
But China?
Oh, and, apparently, the US midwest too. And they just had a conference there.