May I ask, what's the source of your garden soil? Was it the existing soil or did you buy/import/obtain some and from where?
Knowing the source may help narrow down the ID for the seeds in the soil.
Example: I imported some compost from a friend's yard and it contained Pokeweed, crab grass, and other weeds, but it also gave me plenty of Four O'clocks, Cosmos and Zinnia plants.
Your plants (and weeds) look very healthy.
