Plants in the wild are in a continuous battle against insects, molds and fungi and herbivores. They excrete assorted defensive chemical and build others into th

Plants in the wild are in a continuous battle against insects, molds and fungi and herbivores. They excrete assorted defensive chemical and build others into their tissues. A 'pet' plant is protected against a large number of these attacks = it makes less of them. A number of these affect taste and flavor as the herbivore defences are turned off. Caterpillars are herbivore BTW. So these pet plants become more pure pulp. These are my speculations. but I think they are worth studying. Loss of Magnesium is a known decline caused by over use of magnesium by the plants grown and there has not been selective magnesium fertilisation. They should study some of the common rocks to see which ones are suitable to be ground up and added to the soil.