How to collect seeds from Dahlia?

Let the seedheads dry on the plants, now is the time.It can help to pull off some of the back petals to help the drying process.Pull off the pods when they have finally closed, and keep somewhere (like a greenhouse bench) to dry further. In february break the pods onto a tray and gently blow on a small batch at a time to clear all the lighter rubbish from the heavier seeds. The seeds can then be hand sorted, keeping the ones that have a firmer feel to them.

Great peice of info...thanks Darryluk