I had thought the flower or bud was associated with the THC containing marijuana plants and that hemp essentially didn't flower. Is is that now that a very low THC marijuana plant has been bred? If so, what is that advantage of that as far as CBD is concerned over hemp derived CBD?
It is generally accepted that the genus Cannabis has three species, (excluding hybrids) they are C. sativa, C. indica, and C. ruderalis. Some suggest there are as many a six species.
Industrial cannabis AKA "Hemp" is ruderalis. It's grown for fiber and seed. The fiber is excellent for many applications and the seeds are highly nutritious. It contains essentially no THC. In fact no cannabis seeds contain any THC. Ruderalis flowers like all cannabis varieties.
Variaties (hybrids) have been breed for high THC, high CBD and various ratios of both. Charlotte's Web is probably the most famous high CBD hybrid. Search "Charlotte Figi" for more about this, it is a fascinating and moving story. Charlotte's Web is hemp derived but I expect only the breeder knows the exact genetics.
There seems to be a common misconception that CBD is "medicine" and THC is drug abuse. The reality is that the 100 plus cannabinoids and the terpenes work in concert in ways we are only just beginning to understand. From a medical perspective various people and ailments respond differently to different strains with different cannabinoids and ratios.
CBD is CBD regardless of the plant variety it comes from.
I think everyone needs to try a few things to see what suits them, many medical users need high TCH, many do not. It depends.
Finally I sense a feeling from many that getting high is bad, yeah somebody is having harmless fun must put a stop to that!! I suggest there are great medical benefits to getting high and having fun too.