My kids and I did this recently with sone wild berries growing naturally on our property (we have thornless in the garden but juat planted this year and haven't started producing yet) and we made several jars of jam. It was such aa great day of it ❤
@saltyacresnc if you check out a company named pairwise in NC they develop a seedless thornless blackberry just posted this week on website going to trials next phase.