Ah, I see. I had to look it up to see how it was related to Heather and Erica. Calluna vulgaris is not the most attractive plant name.
I'm afraid I just don't care for the sound of Calluna. It reminds me more of Caligula and words like calumniate than anything botanical. Heather and Erica are both better, imo.
Per Google, Calluna is also a font, if you're interested.