When I was in Vaidyagrama, a south indian eco hospital, I was told that the herbs that grew naturally in the area were ones that served the diseases that would naturally arise in the people living in the area. Plants have this bodhisattva way of appearing when we need them.
They say (those people writing memes) that everything you need is right in front of you.
Traditional folk got intimate with their surroundings and could assess the quality of the herbs,and how to use it in cooking and medicine. They created a sacred relationship with plants and used prayer before administration.
Enter super foods. Like super models. Like super highways.
For the most part these are not from our place. We take items from someone else's energetic environment and use them in our own - possibly something that doesn't look like where the herb was grown.
Herbs become extinct. Societies become extinct.
I instantly bought into Dr Claudia Welch's recommendation of lifestyle, then diet, then herbs. She advocates using yourself first before taking from the earth, to the best of your ability.
If Ayurveda is about relationships, which Dr Lad tells us it is, then it makes sense to heal from the relationship to your place.