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Do seeds continue to mature if separated from the plant?

Albany, ME(Zone 4b)

I'm wondering if any seeds finish maturing when separated from the plant for a couple of reasons.

1 - I pull tall asters from a goldenrod field and I want to know if I have to remove the pulled plants to be sure seeds don't germinate they're pulled.

2 - Branches break off easily from my grandiflora delphinium and campanula medium. If the pods have developed but are still somewhat green is it worth keeping the branches to get the seed later?

TIA
LAS

Hamburg, PA(Zone 6b)

Wow! That's a good and hard question. From my experience it depends on the plant. For instance I have some Cuphea pods that were still green when pulled off (couple days ago). I noticed the seeds were still green inside and put them in a paper envelope. The pods continued to mature and the seeds turned brown. And seem to look viable to me. Also I have some Clematis integrifolia seeds which were picked and still green. I placed them in a paper bag and they have continued to mature and are now brown and the fuzzy tail developed.

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