This is one of the things I love about my friend Weesie’s garden. She does things that most of us would not think of doing. Take these old fashioned reseeding petunias you see in the image above. Over the past few years, every time a petunia that was not white started to bloom, she pulled up the plant. Now her whole mass is white, and if you get seeds from her plants, you will get only white petunias. Another trait of her garden is that this area is rarely watered, and you can see how well they do in a year like this one. They are in a sunny location with no irrigation. Another point is that while some organic is added to the soil, they have not been fertilized. Now, if you get the idea that these reseeding white petunias are carefree, you are right.
If you want to get reseeding petunias started in your garden, buy a package of seeds of old fashioned petunias. Grow them according to label directions, or find a garden center that sells them. Of course, you can always harvest some of the seeds from a friend or a fellow gardener who will share some seeds from their plants. Always allow the spent flowers to stay on the plants and produce seed pods, if you want them to come back next year.