I don't think it would survive outside.
Have you seperated it and repotted it lately. That could be the cause of the plant becoming smaller.
You could experiment and put a rhrizome or two in the ground in a protected spot.

Yes, I divided it this year into five pots and planted the rest outside in a somewhat sheltered area as an experiment.

I think the change in the leaves is due to the plant(s) actually being healthy for once. It is the first indoor plant I have managed not to kill.

I have had a clump of cardamom on the north side of my house for years. It has survived being frozen to the ground annually,yet has never once bloomed.Since the seeds are most commonly used in cooking, I would like to know if anyone has had any luck in inducing bloom and how they did it.

Indiana winters are a lot colder than in Florida. While cardamom does well outdoors in summer and likes it on the cool side our Northeastern winters are much too harsh for the plants to be kept outside year round. Giving it a good summer vacation outdoors would surely help plant gorwth.
Will - I don't know of anyone who has succesfully gotten them to bloom.