Here's a list of plants that readily self seed for me in my garden. I either leave them where they are or dig them up to plant them somewhere else in the garden. I also give them away to friends and co-workers, who always appreciate a good free plant.
Plants That Self Seed
Rose Campion - Blooms all summer long with pretty woolly silver-grey foliage. Great for filler in floral arrangements.
Indian Summer - A Black-eyed Susan that re-seeds every year, blooms all summer long with large 3-inch blooms.
Perennial Cornflower or Perennial Bachelor's Button - Some say it's a pest because it can get aggressive, but I love the blue flowers.
Hardy Geranium - Unusual foliage with dark markings, and delicate dark flowers that have a vintage quality. This is one of my all-time favorites.
The common name is Beardtongue but I mostly think of it by its Latin name, Penstemon 'Husker Red.' It's a US native and was named Plant of the Year by the Perennial Plant Association in 1996. Shown here depicts the beautiful dark foliage and as well as in bloom.

This Brunnera has the prettiest shade of blue flowers in the spring. You definitely may need to keep an eye on this one so that it doesn't take over in the garden. Not to be confused with Myosotis sylvatica, commonly known as the forget me not flower which is also a heavy re-seeder.
I hope I've inspired you to add a couple of these beauties to your garden if you don't already have them. I think it's so fun to see them volunteer in different spots in the garden. I get a special thrill when I notice them and realize they are not a weed.
Janice
Red Valerian (Jupiter's beard), Shasta Daisy, and Cosmos are big reseeders in my northwest garden. This spring I was surprised and delighted that my hellebores had multiplied...7 transplantable offspring from one mature hellebore. This is the fun of gardening for me.
Patti
Hi Janice,
I agree. It is fun. I've never grown Red Valerian but the others are known. I have a few hellebores and they are getting big but they are hybrids so I'm afraid they won't multiply like yours. How nice!
Thanks for stopping by and have a great weekend!
Patti
Traci
I love plants that seed themselves. It is always a surprise to see where they pop up. My favorites are poppies and the Black Eyed Susan but I also have Morning Glories, Lobelia and Alyssum and this year some of my Zinnias are coming up. Are they varieties of seeds that do not self-seed? I saved and planted seeds from a Moon Flower Vine but they did not come up.
Traci
Patti
Hi Traci,
Sounds like you have a great place for seeds to land since you have several making their way back to you each year. To answer your question most hybrids are sterile and will not re-seed true to the original plant and for others they just don't make it for one reason or another, usually mother nature. Thanks for stopping by!
Jan
Money Plant self seeds. I have plenty of seeds for sale. E mail if interested.
Patti
My mother used to grow that plant. Thanks for the offer. I'll keep it in mind.