You just might miss out on an incredibly lovely plant!
At another time & place, this might be considered a weed because we didn't plant it. I think the birds must have. I don't know if our neighbor's behind us have this plant growing, but I haven't seen any others in the front yards around the block.
When first growing, it looks like this above. It certainly has a weedy look to it.
But if you let it grow and look close at it, you'll see the beauty in the details.
On the other hand, the #1 reason to actually pull weeds in my book now is so that your dad can't be proven right once again. Is that man EVER wrong??? Bah!
Both my parents and I didn't know what it was so we all guessed... educated guessing, but he turned out to be right. So there ya go Dad, Happy belated Father's Day! That is your present :p
I guessed it was Fennel - it looks a little herb-like, but it turns out all fennel is yellow - not white. And as it grew, it clearly no longer looked like fennel.
Mom guessed it was Anise, and after she said that, I agreed with her. Dad guessed a day later and said it was Queen Anne's Lace. Lucky for me though, he went on vacation that same day, so when I confirmed it later through a little research, I didn't have to tell him he was right. yippee! And since I notice that he doesn't visit here unless sent an email, he doesn't ever have to know.