Cheers, you could have included the info about why you were looking for an ID when you originally posted your picture. You said you suspected what it was and were just looking for confirmation. I'm not sure what kind of responses you expected but I said I was giving you the benefit of the doubt in genuinely wanting to know what it was. Several people sympathized with what you considered an unpleasant experience after they understood why this was posted. Had you been more forthcoming originally, or at least not a stranger, this conversation would have gone differently. I hope you'll stick around and get to know some of the great people here, and continued good luck in meeting a non-loser!

Agree Chasmanthium latifolium. I like this grass as it will grow in sun but is also able to handle dry shade where it will be a little less upright. Also agree it will seed about but the seedlings are easily scratched out when young. Older seedlings transplant well or are easily pulled.

I'm not good with IDs, perhaps a cremnosedum? One thing is for certain, keeping it in a teacup with no drainage holes will likely kill it. tj

Sorry. Site: Sacramento, California. Size 1 1/2 ft. tall? (Have not observed actual plant). Overshadowed by taller neighbors, so not performing at its best; thus the concern that it needs to move. Gray green foliage belongs to this plant. Thanks fellow plant sleuths.