Posted: 07/09/2015 at 18:46
You can sow them, but they are not ripe as Nut says. You need to wait until the seed heads are brown and starting to burst, the seeds will be almost black.
I find they very rarely ripen in my garden, although they are easy to grow from bought seed and will often flower in the first year.
I find you need chip the seeds, then soak for 24 hours, in order to get them to germinate.