Hi chrispea
I collect busy lizzie seeds every year - I love doing this as you never know which colours you are going to get each year as the bees cross pollinate them. A tip from Alan Titchmarsh - put them in the fridge over winter (I usually put them in a small paper bag and then into a plastic container with all my other collected seeds). Since I have been doing this, I have had many more germinating seeds than when I just used to keep them in my greenhouse. Well worth doing I think - loads of freebies :D
Pat