Collect individual fruits, or cut off the entire top and lay it out
on newspaper to dry. Crunch and screen. I prefer to work with individual
fruits... less detritus. Sometimes it's easier just to crunch and then
pick the detritus out of the seeds with fine tipped forceps, under
Pick the petunia fruits when they just crack open before they spill many
of the seeds. Crunch them up with your fingers as you put them in an
old 35mm film container or small glassine envelope.
You can also pick them when they turn yellow before the crack open, and
allow them to dry before crunching them.
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