Thread drift alert!
I see the boronia essential oil is expensive!

Boronia megastigma Ahhhhh!! An aroma to die for. According to those who are seriously into propagating Oz native plants, this species of boronia is particularly tricky to get going and, in the hands of most, becomes an annual rather than a perennial, so I imagine it's not the most common essential oil in the the pharmacopeia.

Years ago, when I was a botany postgrad I demonstrated ("taught") in the Second Year Plant Systematics classes; lots of plants had their private parts dissected and drawn. One class always had everyone in the building skipping along the corridors; it was the one that dealt with Rutaceae (using Boronia megastigma as the sample specimen) and Iridaceae (using Freesias); great bunches were supplied and their aromas went all through the building.

Any left over after the class were hoarded by us postgrads and taken to our desks and our homes.

Ah! Salad Days!

All the best, Michelle!

Cheers, Rowan