A sibling comment mentions that it's non-trivial to produce by someone with just a garden. https://news.ycombinator.com/item?id=28122533
A sibling comment mentions that it's non-trivial to produce by someone with just a garden. https://news.ycombinator.com/item?id=28122533
The process essentially involves blasting the material with solvents, evaporating the material inside a pressure controlled vacuum chamber oven then, collecting the various components in a distillation column as they're evaporated away at different temperatures.
It's a dangerous process that requires high quality equipment and a proper environment to do safely and produce a product you'd actually want to use.
Not the, 'average person can make Willy nilly in their kitchen after growing a few plants' kinda thing. It's more of a requires a trained team of technicians and a certified lab kinda thing.