How do you get the seeds from the gerbera daisies?

In the US, when dill is grown as a farm crop, they are usually harvested with a combine harvester. The cylinder speed and fan speed must both be turned way down, due to the lightness and fragility of the seed.

To hand harvest some dill seed from your garden dill plants, you can just wait until the seed gets dry enough to be pulled off the seed head relatively easily and just "rake" the seed head through your fingers, palm up to catch the seed. Have a bag or other container handy to put the seed in, and you can have a lot of seed gathered up in just a few minutes.