Why is it called "High Horticulture"?

Well, I've got quite a lot of opium poppies this year..........??

lol , and some of the plants on this site seem a bit suspect,,,,,,,,, no help lloyd i know.

I dunno, but think that the "high" refers to consumer demand for a plant/food crop. A crop with a high horticultural value would be one which can easily be grown to meet demand, and very economically-produced, whilst also producing maximum income/profit/return for outlay. Hence, we will forever be buying flowers/plants/fruit/veggies in our shops which have been delivered from far-flung parts of the world. It is, simply, more cost-effective. As for a simple definition, I'm stumped! Perhaps something like "Never before, in the "field" of human consumption, has so much been grown, by so few, for so many".? Sorry I can't be of more "help", Lloyd. Let us know if you find one.