Growing something is easy. Growing a plant or plants healthy and robust enough for a decent harvest is far from easy unless you're already a farmer/grower.
"Growing a plant or plants healthy and robust enough for a decent harvest is far from easy ..."
You can cover up a multitude of sins using solvent extraction + chromatographic separation + blending. If legalization takes off, I suspect we will see the rise of blending conglomerates that assemble products for various tastes and purposes, like we see with whisky.