Chelle: Those yellow croc's came from HD about 10 years ago. There was no cultivar name(s) on the label, but the picture said "mixed colors"...which was bogus because every one of them turned out to be yellow...but that's ok. Mine bloom in late June and July. They're borderline invasive, but easily thinned out and they do multiply VERY quickly. They even come up in the grass. As Neal mentioned, I used them for that architectural feeling at the base of an arch.
Just last week I got these from a reputable nursery:
