I have a Big Pot in which there is a Big Plant. But I don't know what do we say it in english in my native language, we say it, "Gamla" Also, there is no Flower it! :P It looks like this: https://www.dropbox.com/s/r4z35d4kn2f6b57/Nature-Pot-and-Plant-Photograph-520x693.jpg
I would call it a planter:
3) A container, usually decorative, for potted or unpotted house plants
Wikipedia shows a picture of 'flowerpot' which is empty and not necessarily to have flowers in it.
As for the dictionary,
flowerpot (n) - (Horticulture) a pot in which plants are grown.
Plants may or may not have flowers there.
Important- Not to confuse it with pot plant which means...
pot plant (n) - A plant suitable for growing in a flowerpot (especially indoors).