I have a Jubilee blueberry in a container that I planted a couple of months ago. It looks healthy with moderate growth, except for one "sucker" that apparently originates from the base of the plant beneath the soil. It has outgrown all new growth on the plant by 3 or 4 fold. Please see pic. Is this typical behavior? Are blueberries propagated on rootstocks of a different species like trees? If yes, I should probably cut this off, right? If no, should I let this grow and eventually become one of my fruiting canes in the years ahead, or should i still cut it off? FYI, I bought this plant at Home Depot.

Also, in the second picture, there appears to be a single flower from small sucker on the other side of the plant. In September? No other flowers anywhere else on the bush, including what should be the "fruiting wood". It looks like a blueberry flower from my image search, so nothing to worry about, yes?

Thanks for everyone's help!