Ok?

src/main/java/com/volmit/iris/core/SaplingManager.java

@@ -25,5 +25,6 @@ public class SaplingManager implements Listener {
         // TODO: Remove this line
         Iris.info("Sapling grew @ " + event.getLocation() + " for " + event.getSpecies().name() + " bonemealed is " + event.isFromBonemeal() + " by player " + Objects.requireNonNull(event.getPlayer()).getName());
 
+
     }
 }

src/main/java/com/volmit/iris/engine/object/IrisBiome.java

@@ -82,7 +82,8 @@ public class IrisBiome extends IrisRegistrant implements IRare {
     private KList<IrisEntityInitialSpawn> entityInitialSpawns = new KList<>();
 
     @Desc("Sapling override settings")
-    private IrisSaplings saplings = new IrisSaplings();
+    @ArrayType(min = 1, type = IrisSapling.class)
+    private KList<IrisSapling> saplings = new KList<>();
 
     @ArrayType(min = 1, type = IrisEffect.class)
     @Desc("Effects are ambient effects such as potion effects, random sounds, or even particles around each player. All of these effects are played via packets so two players won't see/hear each others effects.\nDue to performance reasons, effects will play arround the player even if where the effect was played is no longer in the biome the player is in.")

src/main/java/com/volmit/iris/engine/object/IrisDimension.java

@@ -66,7 +66,6 @@ public class IrisDimension extends IrisRegistrant {
     private IrisDimension sky = null;
 
     @RegistryListJigsaw
-
     @Desc("If defined, Iris will place the given jigsaw structure where minecraft should place the overworld stronghold.")
     private String stronghold;
 
@@ -75,10 +74,11 @@ public class IrisDimension extends IrisRegistrant {
     private boolean aggressiveBiomeReshuffle = false;
 
     @Desc("Sapling override settings")
-    private IrisSaplings saplings = new IrisSaplings();
+    @ArrayType(min = 1, type = IrisSapling.class)
+    private KList<IrisSapling> saplings = new KList<>();
 
     @Desc("Enable sapling overrides")
-    private boolean useSaplings = false;
+    private boolean overrideSaplings = false;
 
 
     @Desc("Instead of a flat bottom, applies a clamp (using this noise style) to the bottom instead of a flat bottom. Useful for carving out center-dimensions in a dimension composite world.")

src/main/java/com/volmit/iris/engine/object/IrisRegion.java

@@ -80,7 +80,8 @@ public class IrisRegion extends IrisRegistrant implements IRare {
     private KList<IrisEntityInitialSpawn> entityInitialSpawns = new KList<>();
 
     @Desc("Sapling override settings")
-    private IrisSaplings saplings = new IrisSaplings();
+    @ArrayType(min = 1, type = IrisSapling.class)
+    private KList<IrisSapling> saplings = new KList<>();
 
     @MinNumber(1)
     @MaxNumber(128)

src/main/java/com/volmit/iris/engine/object/IrisSapling.java

@@ -1,2 +1,34 @@
-package com.volmit.iris.engine.object;public class IrisSapling {
+package com.volmit.iris.engine.object;
+
+import com.volmit.iris.engine.object.annotations.*;
+import com.volmit.iris.util.collection.KList;
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+import lombok.experimental.Accessors;
+import org.bukkit.TreeType;
+
+@Accessors(chain = true)
+@AllArgsConstructor
+@NoArgsConstructor
+@Desc("Sapling override settings")
+@Data
+public class IrisSapling {
+
+    @Required
+    @Desc("The types of saplings overwritten")
+    @ArrayType(min = 1, type = TreeType.class)
+    private KList<TreeType> types;
+
+    @RegistryListObject
+    @Required
+    @ArrayType(min = 1, type = String.class)
+    @Desc("List of objects to overwrite saplings with")
+    private KList<String> replace = new KList<>();
+
+    @Desc("The size of the square of saplings this applies to (two means a 2 by 2 sapling area")
+    @MinNumber(1)
+    @MaxNumber(4)
+    private int size = 1;
+
 }