I collected some Dirca palustris in spring 2017 and did remove the endocarp for storage. We let the fruits dry a bit then squeezed the seed out by hand. Our greenhouse staff was successful in growing some out afterwards so I don’t think I damaged them. You can see photos before and after here: https://livingcollections.org/mobot/Accession/814351?tab=images
Hi Meg. Thanks for your reply. Actually, I posted this during the platform beta-testing session during the CPC meeting and wasn’t really expecting a response! We have been working to create a seed bank for Dirca decipiens, a G1 species, so your experience is very helpful. I enjoyed visiting with you at the CPC meeting and hope you don’t mind if I pester you with questions about seed banking equipment and facilities. Thanks again! Jim