Hi Sami,
This site shows what the seed pods look like and how to go about sowing the seeds.
http://theseedsite.co.uk/

You should also find this helpful.
http://www.thegardenhelper.com/growingseeds.html

Newt

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When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.

Thanks, Newt - from me too. I've taken note of that page. I too need to know how to find these seeds and how to grow them.

I didn't know you could bring petunias back - they're an annual.

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When sorting seeds, do not whistle.