diff --git a/src/main/java/com/volmit/iris/engine/decorator/IrisSurfaceDecorator.java b/src/main/java/com/volmit/iris/engine/decorator/IrisSurfaceDecorator.java
index dcc102c94..a7b1143fa 100644
--- a/src/main/java/com/volmit/iris/engine/decorator/IrisSurfaceDecorator.java
+++ b/src/main/java/com/volmit/iris/engine/decorator/IrisSurfaceDecorator.java
@@ -62,8 +62,16 @@ public class IrisSurfaceDecorator extends IrisEngineDecorator {
                     }
                 }
 
-                if(decorator.getForceBlock() != null)
+                if(decorator.getForceBlock() != null) {
                     data.set(x, height, z, fixFaces(decorator.getForceBlock().getBlockData(getData()), x, height, z));
+                } else if(!decorator.isForcePlace()) {
+                    if(decorator.getWhitelist() != null && decorator.getWhitelist().stream().noneMatch(d -> d.getBlockData(getData()).equals(bdx))) {
+                        return;
+                    }
+                    if(decorator.getBlacklist() != null && decorator.getWhitelist().stream().anyMatch(d -> d.getBlockData(getData()).equals(bdx))) {
+                        return;
+                    }
+                }
 
                 if(bd instanceof Bisected) {
                     bd = bd.clone();
diff --git a/src/main/java/com/volmit/iris/engine/object/IrisDecorator.java b/src/main/java/com/volmit/iris/engine/object/IrisDecorator.java
index 07373dbdb..51b7c70dd 100644
--- a/src/main/java/com/volmit/iris/engine/object/IrisDecorator.java
+++ b/src/main/java/com/volmit/iris/engine/object/IrisDecorator.java
@@ -55,6 +55,12 @@ public class IrisDecorator {
     private boolean forcePlace = false;
     @Desc("Forced the surface block of this decorant to be the specified block. Assumes forcePlace.")
     private IrisBlockData forceBlock;
+    @ArrayType(min = 1, type = IrisBlockData.class)
+    @Desc("When set, the decorator can only place onto any of these blocks.")
+    private KList<IrisBlockData> whitelist;
+    @ArrayType(min = 1, type = IrisBlockData.class)
+    @Desc("When set, the decorator will never place onto any of these blocks.")
+    private KList<IrisBlockData> blacklist;
     @DependsOn({"scaleStack", "stackMin", "stackMax"})
     @Desc("If stackMax is set to true, use this to limit its max height for large caverns")
     private int absoluteMaxStack = 30;