Agreed; terps are hugely potent... Only need to dip into a few drops of this to find that part out. (this bottle will last me a lifetime) But they can be micro fed into the plant; if it's done correctly during flowers. I hope to prevent cancer; so this is why I mess with this particular one; plus it's wonderful scent and taste I love. (made from lavender flowers) My lungs have vastly improved these days.
I wouldn't even suggest touching this stuff; in it's 100% pure form; it will burn you. This bottle is pharmaceutical lab grade materials.
Terpenes can be adjusted in the grow IMO; it's not just the cultivars itself;
but agree genetics are certainly the biggest contributing factors.
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For instance; I'll use say 1 or 2 ml of this; mix it with the tween (polysorbate 20%) and some heat energy, then solubilize it into say 10 oz of H2O... Then during flowers; I will give only say; a 1-2 mL (of the dilute) into the finial feeding mixtures; always at the end of mixing the fertilizer compositions.. Need to monitor the pH again...
Massive terpene scents in final products.
This is simply one example; there are several. Another more simple (natural) method would be picking the sap off of trees; and putting that into your mixtures. I've done that one also.
In the end; I think it's about the plants having the right mixture of pre-cursor chemicals; as it is about the instructions within the genetics;
both are equally important. Lets not forget environment either.