Posted: 12/07/2015 at 11:30
I try and leave the seeds on the plant until they are fully formed. A lot of seeds become brown or black and come away from the plant really easily.
If you take off the seeds when they are not fully formed I don't think they will germinate. Once collected, store in a paper envelope and then sow
I've got seeds forming on my delphs but they are no where near ready, the seed pods are still green, they should be brown and you will be able to see the seeds inside them when they are ready