I'm wondering what this is.

[Brontosaurus]

It sort of reminds me of Sedum rubrotinctum. I find it growing like a weed in with other plants, but I'm wondering if it's a noxious weed or a plant that we cultivated and it accidentally got in with some of the other plants. I'm wondering if y'all know anything.

[esp_imaging]

It's probably another Sedum - looks like Sedum album, or a similar species. S. album apparently occurs across large parts of Eurasia and north African. Maybe it's widely introduced across America, or there is a similar native species?

[Brontosaurus]

We sell a lot of S. album, so it's totally possible that it's become a weed in the greenhouse.