Abstract: A method for the just-in-time delivery of harvested plant material and plant compounds grown in a genetically-isolated growth environment is provided. The desired crop is grown in an underground growth chamber according to a predetermined growing model in which all growing conditions are controlled. Component yield and completion time can be accurately forecast such that the harvest time of the plant material, or the completion of upstream plant extract recovery, can be accurately forecast. The use of an underground growth chamber allows for complete control over environmental factors in growth of the plant material, and also allows for the best possible protection of the growing environment against any contamination of genetic material from outside of the chamber, as well as protection of the outdoor environment against any contamination of genetic material from inside of the chamber. The method will be particularly useful in the production of plant-made pharmaceuticals and nutraceutical.