Precious jewels
A feature of the gardening world, which probably strikes me rather more forcibly than it does you, is the number of amateur plant specialists there are. These are experts in one area of plantsmanship, usually, who aggregate in groups in order that they can exchange technical talk, test their skills in competition and learn from their fellow-enthusiasts. Although hidden from general view (unless you become an expert yourself and start looking for them), these people add much to the sum of our understanding about plants, whenever their expertise leaks out of learned journals and into the popular prints. The layman may find their conversation mystifying, even sometimes tedious, but it is pleasing to know that it goes on.