Very interesting dg, I had no idea.  I've seen pictures of pink peyote growing on pereskiopsis grafts under lights.  Is this the same or similar genetic abnormality?

I wonder if planting into soil a grafted cacti with the pereskiopsis that has already established its root system would keep the rapid growth cycle going.  I've not heard of this, but it does seem to make sense because you have essentially increased the nutrient pipeline to the grafted cacti with the pereskiopsis tube.