Posted: 21/08/2012 at 18:22
Jean - For myself I prefer to grow from fresh seed every year. Having said that, I know that a lot of people get pleasure from saving their own seed.....so good luck to them!
You can save your SP seed, but F1 varieties won't come true, but you could end up with some weird & wonderful combinations.
Providing you have made sure that your seed is thoroughly ripe, it will be fine to sow in the coming autumn and the mildew will not affect the seed.
Harvest the seedpods when they are dry & brittle and select them from the healthiest plants. Keep the seed dry in paper bags (not plastic) until they are sown.