They look like spent bloom stems. So, yes, trim them off.

I wouldn't trim..they can rebloom on those stalks,I was told ( I have the plant,never trim). Calandrinia is easy as pie in the ground..in pots it can change. Usually they do well in large pots or planters..but even then they look weedy compared to in ground's denser plants,more blooms.

Since they look good in the nursery- it must be that once they fill a pot with roots,the decline sets in pretty fast.

It's a plant that requires quite a bit of maintenance, like Senecio mandraliscae--regular, attentive cutting back required.

Hoov is right....I imagine its one of those that need to be cut far back in a few years and best to replant with some fresh cuttings. Cotyledon orbicularis- Pigs Ears- is much like that or its gets leggy and thin.

On the positive side? If mine gets picked every now and then by admirers plenty more is coming very soon.

6 months of mine...and its near the head back stage.