What environmental factors most affect the plants?

It's a combination of all the factors in the environment - the light, the temperature, the CO2 in the air, what you feed them, the type of media they're in, whether it's peat moss or other kind of soil-less media or no media at all. It's really a lot of different things. So it's not that easy, unfortunately.

If you stress a plant, the plant will try to reproduce and produce more of those chemical compounds. It's their way of defending themselves against predators in the wild. But that doesn't mean we always want to stress them, because we want to have the right proportions of the right chemicals. Getting more of a certain chemical doesn't necessarily make the plant more medicinally effective.
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