diff --git a/library/include/dfhack/modules/Vegetation.h b/library/include/dfhack/modules/Vegetation.h
index e874830d8..0e8b121ac 100644
--- a/library/include/dfhack/modules/Vegetation.h
+++ b/library/include/dfhack/modules/Vegetation.h
@@ -44,11 +44,11 @@ namespace DFHack
         uint32_t is_burning; // 0x50: yes, just one flag
         uint32_t hitpoints; // 0x54
         /**
-         * 0x58 - maybe related to the order in which plants are updated
-         * the updates are staggered into 8 groups?
+         * 0x58 - the updates are staggered into 9? groups. this seems to be what differentiates the plants.
          */
-        uint32_t unknown_3;
+        uint32_t update_order;
         // a vector is here
+        // some more temperature stuff after that
     };
     /**
      * Plant object read from the game
diff --git a/tools/examples/treedump.cpp b/tools/examples/treedump.cpp
index af6bf9b96..b599b6656 100644
--- a/tools/examples/treedump.cpp
+++ b/tools/examples/treedump.cpp
@@ -50,7 +50,7 @@ void print_tree( DFHack::Context * DF , DFHack::dfh_plant & tree)
     printf("temperature 2: %d\n", tdata.temperature_2);
     printf("On fire: %d\n", tdata.is_burning);
     printf("hitpoints: 0x%08x\n", tdata.hitpoints);
-    printf("unknown_3: 0x%08x\n", tdata.unknown_3);
+    printf("update order: %d\n", tdata.update_order);
     printf("Address: 0x%x\n", tree.address);
     hexdump(DF,tree.address,13*16);
 }