Contrary to the information in an earlier comment, this plant keeps its golden foliage and does not usually revert to dark green. Sounds like a fluke. I've had mine for 3 years and it always comes back golden. Dried leaves have a slight licorice flavor. Makes great herbal tea mixtures. Try it with chamomile.
This probably only occurs when self-sown seedlings have green leaves and aren't weeded out. I winter sowed mine and saw some green seedlings among the golden. I just weeded them out and don't expect to see the golden plants remaining to turn green.
