Some of my favorite plants in my flower gardens are reseeding annuals. I don't put down mulch specifically for their benefit. If I did mulch the perennial beds they wouldn't be able to sprout. Here is a pictorial list of most of them. Some aren't blooming yet, like the sunflowers, and aren't included. Maybe I'll do a late summer list.
I garden in Northern NY and try to coerce my husband, step daughter and 2 young sons into helping me as much as possible. I am also a Master Gardener volunteer and enjoy that program immensely. Our house is now surrounded with perennial beds and I feed my family from the bounty of a modest vegetable garden.