Do you have them in full sun?
How wet are you keeping them?
I gave my SIL a couple plants and hers are slowly dying. I think she is keeping them too wet.

Shelley

They are still in the basement under lights because they were still forecasting chance of frost this past week. Should I put them outside now. The other plants under lights are doing fine. Maybe the pot was too wet. I should be able to put them in the unheated greenhouse now though. I've got a few things out there to harden off and keep the door and one window open. Thanks .

I've had mine outside for quite a while. They like sun, so maybe that is the problem.
Last fall I had mine outside and it froze quite hard. Only the flowers were damaged. The leaves can take a bit of quite a bit of frost. Although they will be quite tender now.

Shelley