Thanks for the comments, all!
Yes, that is the non-native ice plant. Though I don't hear much talk of its removal... I guess we've just accepted it by now.
Regarding the sharpness, thanks! I think I probably achieved it just by a small aperture and tripod. Though this is a blend of three different images with three different exposures, so it's possible I focus-stacked them too, but I don't think so.
There might be a little barrel distortion. There was more initially, and I corrected it on photoshop, but perhaps I didn't go far enough.