I don't usually try to ID DYCs (D*** Yellow Compositae) from photos, but
I'll send you to look among the Lactuca species for the first one.
http://plants.usda.gov/java/stateSea...ag eField.y=7
The second sure looks like redroot pigweed, Amaranthus retroflexus,
but again, from photos, it's an iffy ID.
Did you bring in manure or compost from an outside source? Birdfeeder?
Kay