Flower or weed?

We think of a weed as something that grows where it's not supposed to.  A weed can have a lovely flower, so "beauty" is not a criteria.  I found this poppy growing in a patch of other weeds.  I normally till this spot, but this year the ground has been too wet to till until now.  Because of that, this poppy grew where there have never been poppies, probably from seed dropped by birds.  I wonder if that makes it a weed?  I left it there, hoping it will drop its seeds and I'll have more next year.