Hi I often have lots of these growing in my garden and potted plants also, it looks like a a weed call "Amaranthus"

Weeds. Not sure about the plant on the top left.

Def. in the Amaranth family - Amaranthus blitoides? Looking very healthy & large too! I would pull & compost it before it sets seed.

Is the other a canna or ginger?

Back in the day we used to call them weeds, but now I have to be politically correct so I refuse to venture a guess.

MOO

Pigweed amaranth