diff --git a/src/main/java/world/bentobox/greenhouses/Greenhouses.java b/src/main/java/world/bentobox/greenhouses/Greenhouses.java
index 68bef85..d3ed568 100644
--- a/src/main/java/world/bentobox/greenhouses/Greenhouses.java
+++ b/src/main/java/world/bentobox/greenhouses/Greenhouses.java
@@ -92,8 +92,8 @@ public class Greenhouses extends Addon {
      */
     @Override
     public void onDisable() {
-        if (manager != null) {
-            if (manager.getEcoMgr() != null) manager.getEcoMgr().cancel();
+        if (manager != null && manager.getEcoMgr() != null) {
+            manager.getEcoMgr().cancel();
         }
     }
 
diff --git a/src/main/java/world/bentobox/greenhouses/greenhouse/BiomeRecipe.java b/src/main/java/world/bentobox/greenhouses/greenhouse/BiomeRecipe.java
index 10e632e..f51f67a 100644
--- a/src/main/java/world/bentobox/greenhouses/greenhouse/BiomeRecipe.java
+++ b/src/main/java/world/bentobox/greenhouses/greenhouse/BiomeRecipe.java
@@ -419,7 +419,7 @@ public class BiomeRecipe implements Comparable<BiomeRecipe> {
      * @return a list of blocks that are required for this recipe
      */
     public List<String> getRecipeBlocks() {
-        return requiredBlocks.entrySet().stream().map(en -> Util.prettifyText(en.getKey().toString()) + " x " + en.getValue()).collect(Collectors.toList());
+        return requiredBlocks.entrySet().stream().map(en -> Util.prettifyText(en.getKey().toString()) + " x " + en.getValue()).toList();
     }
 
     /**
@@ -471,10 +471,10 @@ public class BiomeRecipe implements Comparable<BiomeRecipe> {
 
     private boolean canGrowOn(GrowthBlock block, GreenhousePlant p) {
         // Ceiling plants can only grow on ceiling blocks
-        if (CEILING_PLANTS.contains(p.plantMaterial()) && block.floor()) {
+        if (CEILING_PLANTS.contains(p.plantMaterial()) && Boolean.TRUE.equals(block.floor())) {
             return false;
         }
-        return p.plantGrownOn().equals(block.block().getRelative(block.floor() ? BlockFace.DOWN : BlockFace.UP).getType());
+        return p.plantGrownOn().equals(block.block().getRelative(Boolean.TRUE.equals(block.floor()) ? BlockFace.DOWN : BlockFace.UP).getType());
     }
 
     /**
diff --git a/src/main/java/world/bentobox/greenhouses/listeners/SnowTracker.java b/src/main/java/world/bentobox/greenhouses/listeners/SnowTracker.java
index 196f7b1..2bf05c3 100644
--- a/src/main/java/world/bentobox/greenhouses/listeners/SnowTracker.java
+++ b/src/main/java/world/bentobox/greenhouses/listeners/SnowTracker.java
@@ -5,6 +5,7 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
+import java.util.Optional;
 
 import org.bukkit.Bukkit;
 import org.bukkit.Material;
@@ -24,7 +25,6 @@ import org.bukkit.scheduler.BukkitTask;
 import org.bukkit.util.BoundingBox;
 
 import com.google.common.base.Enums;
-import com.google.common.base.Optional;
 
 import world.bentobox.bentobox.util.Util;
 import world.bentobox.greenhouses.Greenhouses;
@@ -100,7 +100,7 @@ public class SnowTracker implements Listener {
     }
 
     private boolean placeSnow(Block b) {
-        Optional<Material> snowCauldron = Enums.getIfPresent(Material.class, "POWDER_SNOW_CAULDRON");
+        Optional<Material> snowCauldron = Enums.getIfPresent(Material.class, "POWDER_SNOW_CAULDRON").toJavaUtil();
         if (snowCauldron.isPresent()) {
             if (b.getType().equals(Material.CAULDRON)) {
                 b.setType(snowCauldron.get());