diff --git a/OpenRa.Game/Actor.cs b/OpenRa.Game/Actor.cs
index 759a4ad391..5fbdf6dcd2 100755
--- a/OpenRa.Game/Actor.cs
+++ b/OpenRa.Game/Actor.cs
@@ -83,7 +83,10 @@ namespace OpenRa.Game
 			if (!Rules.Map.IsInMap(xy.X, xy.Y))
 				return null;
 
-			var underCursor = Game.UnitInfluence.GetUnitAt( xy ) ?? Game.BuildingInfluence.GetBuildingAt( xy );
+			var underCursor = Game.UnitInfluence.GetUnitAt( xy ) 
+				?? Game.BuildingInfluence.GetBuildingAt( xy );
+			if (underCursor != null && !underCursor.unitInfo.Selectable)
+				underCursor = null;
 
 			return traits.WithInterface<Traits.IOrder>()
 				.Select( x => x.IssueOrder( this, xy, lmb, underCursor ) )
diff --git a/OpenRa.Game/Game.cs b/OpenRa.Game/Game.cs
index 8041feb2c7..3d884a53a8 100644
--- a/OpenRa.Game/Game.cs
+++ b/OpenRa.Game/Game.cs
@@ -276,6 +276,7 @@ namespace OpenRa.Game
 		public static IEnumerable<Actor> SelectActorsInBox(float2 a, float2 b)
 		{
 			return FindUnits(a, b)
+				.Where( x => x.unitInfo.Selectable )
 				.GroupBy(x => (x.Owner == LocalPlayer) ? x.unitInfo.SelectionPriority : 0)
 				.OrderByDescending(g => g.Key)
 				.Select( g => g.AsEnumerable() )
diff --git a/OpenRa.Game/GameRules/UnitInfo.cs b/OpenRa.Game/GameRules/UnitInfo.cs
index 2d1ef73114..a4e6d05cd5 100755
--- a/OpenRa.Game/GameRules/UnitInfo.cs
+++ b/OpenRa.Game/GameRules/UnitInfo.cs
@@ -54,6 +54,7 @@ namespace OpenRa.Game.GameRules
 		public readonly bool MuzzleFlash = false;
 		public readonly int SelectionPriority = 10;
 		public readonly int InitialFacing = 128;
+		public readonly bool Selectable = true;
 
 		public UnitInfo(string name) { Name = name; }
 	}
diff --git a/trees.ini b/trees.ini
index 0fee0faf5c..40a1f283aa 100644
--- a/trees.ini
+++ b/trees.ini
@@ -26,165 +26,165 @@ Description=Tree
 Traits=Building, RenderBuilding
 Footprint=x_ x_
 Dimensions=2,2
-SelectionPriority=-1
 Name=T01
+Selectable=no
 
 [T02]
 Description=Tree
 Traits=Building, RenderBuilding
 Footprint=x_ x_
 Dimensions=2,2
-SelectionPriority=-1
 Name=T02
+Selectable=no
 
 [T03]
 Description=Tree
 Traits=Building, RenderBuilding
 Footprint=x_ x_
 Dimensions=2,2
-SelectionPriority=-1
 Name=T03
+Selectable=no
 
 [T05]
 Description=Tree
 Traits=Building, RenderBuilding
 Footprint=x_ x_
 Dimensions=2,2
-SelectionPriority=-1
 Name=T05
+Selectable=no
 
 [T06]
 Description=Tree
 Traits=Building, RenderBuilding
 Footprint=x_ x_
 Dimensions=2,2
-SelectionPriority=-1
 Name=T06
+Selectable=no
 
 [T07]
 Description=Tree
 Traits=Building, RenderBuilding
 Footprint=x_ x_
 Dimensions=2,2
-SelectionPriority=-1
 Name=T07
+Selectable=no
 
 [T08]
 Description=Tree
 Traits=Building, RenderBuilding
 Footprint=x_
 Dimensions=2,1
-SelectionPriority=-1
 Name=T08
+Selectable=no
 
 [T10]
 Description=Tree
 Traits=Building, RenderBuilding
 Footprint=xx xx
 Dimensions=2,2
-SelectionPriority=-1
 Name=T10
+Selectable=no
 
 [T11]
 Description=Tree
 Traits=Building, RenderBuilding
 Footprint=xx xx
 Dimensions=2,2
-SelectionPriority=-1
 Name=T11
+Selectable=no
 
 [T12]
 Description=Tree
 Traits=Building, RenderBuilding
 Footprint=xx xx
 Dimensions=2,2
-SelectionPriority=-1
 Name=T12
+Selectable=no
 
 [T13]
 Description=Tree
 Traits=Building, RenderBuilding
 Footprint=xx xx
 Dimensions=2,2
-SelectionPriority=-1
 Name=T13
+Selectable=no
 
 [T14]
 Description=Tree
 Traits=Building, RenderBuilding
 Footprint=xx xx
 Dimensions=2,2
-SelectionPriority=-1
 Name=T14
+Selectable=no
 
 [T15]
 Description=Tree
 Traits=Building, RenderBuilding
 Footprint=xx xx
 Dimensions=2,2
-SelectionPriority=-1
 Name=T15
+Selectable=no
 
 [T16]
 Description=Tree
 Traits=Building, RenderBuilding
 Footprint=x_ x_
 Dimensions=2,2
-SelectionPriority=-1
 Name=T16
+Selectable=no
 
 [T17]
 Description=Tree
 Traits=Building, RenderBuilding
 Footprint=x_ x_
 Dimensions=2,2
-SelectionPriority=-1
 Name=T17
+Selectable=no
 
 [TC01]
 Description=Tree
 Traits=Building, RenderBuilding
 Footprint=xx xx
 Dimensions=2,2
-SelectionPriority=-1
 Name=TC01
+Selectable=no
 
 [TC02]
 Description=Tree
 Traits=Building, RenderBuilding
 Footprint=xx xx
 Dimensions=2,2
-SelectionPriority=-1
 Name=TC02
+Selectable=no
 
 [TC03]
 Description=Tree
 Traits=Building, RenderBuilding
 Footprint=xx xx
 Dimensions=2,2
-SelectionPriority=-1
 Name=TC03
+Selectable=no
 
 [TC04]
 Description=Tree
 Traits=Building, RenderBuilding
 Footprint=xxx xxx xxx
 Dimensions=3,3
-SelectionPriority=-1
 Name=TC04
+Selectable=no
 
 [TC05]
 Description=Tree
 Traits=Building, RenderBuilding
 Footprint=xxx xxx xxx
 Dimensions=3,3
-SelectionPriority=-1
 Name=TC05
+Selectable=no
 
 [MINE]
 Description=Ore Pit
 Traits=Building, RenderBuilding
 Footprint=x
 Dimensions=1,1
-SelectionPriority=-1
-Name=MINE
\ No newline at end of file
+Name=MINE
+Selectable=no
\ No newline at end of file