Posted: 23/08/2014 at 19:43
Wendy............lovely plants aren't they ?
Usually an annual, the last winter has been mild enough for some sheltered plants to spring up again without too much problem. They usually seed themselves quite happily but if you want to save seed for next year, you can at least choose where to plant them.
Once the pods have started to turn brown but before they split is the best time to catch the seed. Store in paper bag, envelope or whatever and keep them in a cool place and you can then sow them next year.
Provided they are not F1 variety, you have a good chance of them coming true.