Parsley flowers are so small, they can be hard to notice when they finally bloom. The seeds are about the same size as the numerous flowers and are just as plentiful.
Seeds will sprout easily as long as there is plenty of moisture. Under, or near, a water faucet is a good place to start a parsley bed. Later on, seeds can be spread to other places to see where the emerging plants best like the prevailing micro-climate. This particular bed has been reseeding itself for many years, and I think it is in need of rejuvenation. This is where timing comes into play – I need to wait until the plants go to seed, then save some seeds, just in case there are any challenges (like a heat wave) when the planting bed is cleaned up.
In the upper right are parsley leaves, don’t be misled by the sage leaves in the upper left of this photo. Sage and parsley live together with stray violets, and are protected from deer in this fenced planting bed. I keep any other interlopers (weeds) out in an effort to encourage what I want to live here to thrive.