I wrote a post on here about taking cuttings and putting them in the same pot as the original plant. This seems to work, and there are no fiddley labels and tiny pots deal with.
I am going to try this with some seeds. There are about three Verbascum Olympicum (grows to over six feet in height) in the garden, from which I have saved seeds. If I clear a small area next to a mature plant, the seeds might grow. This is based on a guess that the soil, and light conditions are right for the plant.