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Thank you, I was thinking the same. Will only grow criollo then to insure absolute purity of this endangered cacao tree.
After searching many sources this just sums it up "Cocoa trees cross-pollinate freely. In the Western Hemisphere, there are few plantations that have just one species of cocoa because these trees cross-pollinate naturally. Even within a single tree you may find the characteristics of several varieties. Uniformity exists only when plantations were developed using the rooted branch cuttings of a single mother tree". Now as to how far it can be cross pollinated I cant find out but most likely it would be as far as an average midge flies. So however far a midge flies is how far it will cross pollinate.It still makes me wonder if the cupuassu(Theobroma Grandiflorum) could also be cross pollinated with criollo. I guess it would take first hand experience to actually know for sure so TO BE CONCLUDED.