I have my own triffid, er Salvia plant (IT'S TAKING OVER THE HOUSE! SEND HELP!) and the leaves once dried are regular green. I have a few 5x/10x vials of enhanced leaf (haven't even tried the 10x yet, the 5x is more than enough for now) and that leaf is a bit darker though I wouldn't go as far as calling it black

If it's still legal in Canada (as it is here in the UK) I'd encourage you to buy a plant. They're super easy to grow. I keep mine indoors mostly to avoid insects and the winter snows/frosts, seems to be quite happy inside.

As an aside, have you looked into using Passiflora to help with anxiety? If you're on pharmeceutical medication of course I'd recommend checking there aren't any contra-indications in using it in conjunction, but I had episodic panic attacks for a while about 10 years ago (I think in part provoked by having used cannabis too much). I self-prescribed a combo of passiflora, hawthorn and motherwort to regulate heart function and soothe anxiety - to very good effect. Just a suggestion anyway