That sounds like something I’d like to try! I’m going to see if I can get hold of some heirloom tomatoes. There’s an elderly couple here who sell fresh produce from their garden, so if anyone would have heirlooms, it would be them.
Are you supposed to also put the potting soil/peat/sand mixture on top of the slices to cover them? Or just leave t hem “as is”?
If you are going to do this make certain that you are using an Heirloom that has not cross pollinated with another variety or it will produce a hybrid. Farmers with a family heirloom generally plant a couple of plants isolated somewhere away from the garden.
Just leave as is no spil on top of slices.