In France there is an island in the river, and it appears there is no way to get to it. However, one of the adventures (sorry, I forget which) leads you into a tomb on the "mainland" which in turn takes you to the tomb that is under the island. You then exit onto the island. Anyway, the tomb that is directly underneath the island has many plants in it. There are several money trees, all of the grape varieties, flame fruit and...... BOTH life fruit and death flower.
I assume there are spawn timers on the life fruit and death flower. My first trip there I got the life fruit, the next time I went there was a death flower that hadn't been there before. The life fruit was behind a group of pushable statues. The death flower was next to the tent.
Oh, and incidentally, there's glowy butterflies there, too.