Do Thunbergia Reseed Themselves. I do save some I just pop the seeds onto a paper towel let them dry out for a day and then fold up the piece of paper towel and store them in a container in the garage. It tolerates partial shade but flowering may be reduced.
Cosmos produces long skinny black seeds that spread themselves all over the flower bed. Do black eyed Susan vines reseed. They regular orange one does better then the one you have pictured though.
If you dont want them to reseed themselves remove spent flowers before their seeds develop.
I do save some I just pop the seeds onto a paper towel let them dry out for a day and then fold up the piece of paper towel and store them in a container in the garage. Cutting back pruning and dividing It is important to wait until the foliage dies down naturally as cutting back too early can lead to blindness next year. Do coneflowers reseed themselves. Theres not much you need to do to keep them pretty though deadheading will tidy them up.