This is strange. Why on earth you want to know how the growing conditions where before you buy a plant? The point about buying at vendors/growers - as compared to revendors like flower shops etc. - is that we may assume that they grow under most efficient conditions = best conditions for the plants (which must not be optimum) with the least input needed to archive that. They don't want to have the plants on the shelves, they want to sell them as soon as possible! What you must know are the needs of the plant you want to buy. Because the growing conditions you can offer - and your abilities in improving them to fit the plants' needs - will limit the type of plant you can chose. Because a plant does not adapt itself to the growing conditions you will offer, its you who must adapt the growing conditions to the necessities of the plant, species or hybrid. How can a vendor know the growing conditions - and the abilities you have or don't - you can offer? Of course, a plant grown under nearly optimal conditions in a GH will need to harden a bit when growing on a window sill or even outside, but that is all the adaptation you can expect. Though it will tell you if it's not happy! And yes, that implies that you merge into the information pool and search among all information there is, the good and the wrong. A good book would do that part for you! But in internet its you who must discern between fake information and right information. But a plant is a living being as a pet can be, and well deserves this part of responsibility. In the end, this hobby is just that - keeping them alive as long as possible and making them thrive under the growing conditions we do continuously improve to meet the needs of our plants.