Last time I did it I soaked 2 tablespoons of dried peppermint & 1teaspoon of freshly ground cardamom seeds in 6 oz of alcohol for 2 hours (room temperature), & then proceeded with the usual tincture process.

You can pick out all 3 ingredients, but the cardamom is dominant.

I think the some of the aromatic compounds in all 3 are related (phenols & terpenoids, I think). I have no idea if their presence affects either the thc or its extraction.

Potency of my last batch was slightly lower, but well within the normal variance I've noticed (each batch is slightly different).

Something is going on between the herbs, because as soon as you add the cannabis to the infused alc, the color changes - it turns a rather brilliant green, different from either regular green dragon or the p'mint/c'mom infused alc. The final product is the usual brown-green.