Index: trunk/src/org/openstreetmap/josm/data/validation/tests/UnclosedWays.java
===================================================================
--- trunk/src/org/openstreetmap/josm/data/validation/tests/UnclosedWays.java	(revision 4293)
+++ trunk/src/org/openstreetmap/josm/data/validation/tests/UnclosedWays.java	(revision 4294)
@@ -69,5 +69,5 @@
 
         test = w.get("natural");
-        if (test != null && !"coastline".equals(test) && !"cliff".equals(test)) {
+        if (test != null && !"coastline".equals(test) && !"cliff".equals(test) && !"tree_row".equals(test)) {
             set(1101, marktr("natural type {0}"), test);
         }