this stonecrop is wild. it is the only one in the park, and it is growing from the ~1ft wide crack between the river embankment and the sidewalk, which is behind this fence. the rest of this area is full of invasive plants like spurges and bromes. the park is cultivating native prairie plants in other areas, so it's unlikely that any of this area was planted deliberately.
this is the same one I saw before: https://www.inaturalist.org/observations/217436950