I planted a wisteria seed six months ago in a pot of fresh potting soil from the hardware store. The wisteria seed was from a plant I gave to a friend two years ago. That plant was from a seed I picked off of an abandoned house wisteria plant near the road while working for the telephone company six years ago.
The wisteria seed sprouted and was producing a great looking plant about three feet tall, still in the pot.
Two weeks ago I noticed another plant growing in the pot with the wisteria. It has taken over the pot and is growing at an alarming rate, but I don't know what it is. I don't want to kill it until I can ID the plant.
It might be a weed, but we have been living here for 20 years and we have 8 acres and this new plant is not native to my 8 acres. The is no way the new seed plant fell off another tree or bush since it's full sun above it.
Maybe a seed a wild goose dropped into the pot while flying south for the winter.