A few months ago, this thing sprouted in my vegetable garden right next to a tomato plant. It is about 24" tall, and it has big leaves up to 6" across. I have never seen a weed like this, and I haven't seen any plants nearby in the neighborhood that look similar. I live in suburban Phoenix (Zone 9), so it appears to be very tolerant of the heat (The tomato plant is long dead). The plant gets shade most of the day, but is in direct heat in the afternoon during the hottest part of the day. I have tried a few online plant identification sites and the closest thing i found was Birch, but I figured that couldn't be right.
Is this just a weed, or is it possibly something worth saving and maybe transplanting? I sometimes bury kitchen vegetable scraps in that spot as a sort of compost, and have had things sprout before.