i believe that the improved, not the unimproved oleracea is actually P. umbraticola. the difference is in the leaves...and it's possible that this poster's plant is umbraticola and not grandiflora. i jumped to a conclusion without asking for a look at the leaves. grandiflora has pointy leaves and umbraticola has thick, wide, flattened leaves. oleracea also has wide, flat leaves but it is the wild form and only comes in yellow.
I am so glad you cleared that up for me! I used to use the species name umbraticola but the seed sellers refer to them as oleracea, which felt wrong, but I accepted it. It is likely another instance of sellers using nomenclature of convenience rather than accuracy.