The only zone where Ripened Heartfruit is actually foraged is Greater Faydark. I can verify that after about 6 hours foraging in each zone listed by posters below of Greater Faydark, Surefall Glade, Nedaria's Landing, Dulak's Harbor, Apparently foraging is a tricky subject for some people.
And no, it does not matter whether you stand atop the combine spires or inside an orc tent, foraging rates are the same zone wide. In this case Ripened Heartfruit is a lore item so you're only ever going to forage one anyway. After the first one, "Duplicate Lore Items are not allowed." is the message that randomly appears while foraging.