Done all the placement requirements for flowers, plants and grass.

src/minecraft/biomesoplenty/blocks/BlockBOPFlower.java

@@ -3,6 +3,7 @@ package biomesoplenty.blocks;
 import java.util.List;
 
 import biomesoplenty.BiomesOPlenty;
+import biomesoplenty.api.Blocks;
 import biomesoplenty.blocks.renderers.FoliageRenderer;
 
 import net.minecraft.block.Block;
@@ -105,6 +106,50 @@ public class BlockBOPFlower extends BlockFlower
             list.add(new ItemStack(blockID, 1, i));
     }
     
+    protected boolean canThisPlantGrowOnThisBlockID(int id, int meta)
+    {
+        switch (meta)
+        {
+            case 10: // Toadstool
+                return id == Block.grass.blockID || id == Block.dirt.blockID || id == Block.mycelium.blockID;
+                
+            case 11: // Cactus
+                return id == Block.sand.blockID;
+
+            default:
+                return id == Block.grass.blockID || id == Block.dirt.blockID || id == Block.tilledField.blockID;
+        }
+    }
+    
+    @Override
+    public boolean canPlaceBlockOnSide(World world, int x, int y, int z, int side, ItemStack itemStack)
+    {
+        int id = world.getBlockId(x, y - 1, z);
+        int meta = itemStack.getItemDamage();
+        
+        if (itemStack.itemID == this.blockID)
+            switch (meta)
+            {
+                case 10: // Toadstool
+                    return id == Block.grass.blockID || id == Block.dirt.blockID || id == Block.mycelium.blockID;
+                    
+                case 11: // Cactus
+                    return id == Block.sand.blockID;
+
+                default:
+                    return id == Block.grass.blockID || id == Block.dirt.blockID || id == Block.tilledField.blockID;
+            }
+        else
+            return this.canPlaceBlockOnSide(world, x, y, z, side);
+    }
+    
+    @Override
+    public boolean canBlockStay(World world, int x, int y, int z)
+    {
+        return (world.getFullBlockLightValue(x, y, z) >= 8 || world.canBlockSeeTheSky(x, y, z)) 
+                && this.canThisPlantGrowOnThisBlockID(world.getBlockId(x, y - 1, z), world.getBlockMetadata(x, y, z));
+    }
+    
     @Override
     public int damageDropped(int meta)
     {

src/minecraft/biomesoplenty/blocks/BlockBOPFoliage.java

@@ -5,6 +5,7 @@ import java.util.List;
 import java.util.Random;
 
 import biomesoplenty.BiomesOPlenty;
+import biomesoplenty.api.Blocks;
 import biomesoplenty.blocks.renderers.FoliageRenderer;
 
 import net.minecraft.block.Block;
@@ -74,15 +75,30 @@ public class BlockBOPFoliage extends BlockFlower implements IShearable
     }
     
     @Override
-    public boolean canPlaceBlockAt(World world, int x, int y, int z)
+    public boolean canPlaceBlockOnSide(World world, int x, int y, int z, int side, ItemStack itemStack)
     {
-        return super.canPlaceBlockAt(world, x, y, z) && this.canThisPlantGrowOnThisBlockID(world.getBlockId(x, y - 1, z), world.getBlockMetadata(x, y, z));
+        int id = world.getBlockId(x, y - 1, z);
+        int meta = itemStack.getItemDamage();
+        
+        if (itemStack.itemID == this.blockID)
+            switch (meta)
+            {
+                case ALGAE: // Dead Grass
+                    return id == Block.waterStill.blockID;
+    
+                default:
+                    return id == Block.grass.blockID || id == Block.dirt.blockID || id == Block.tilledField.blockID;
+            }
+        else
+            return this.canPlaceBlockOnSide(world, x, y, z, side);
     }
 
     protected boolean canThisPlantGrowOnThisBlockID(int blockID, int metadata)
     {
         if (metadata == GRASSTOP)
             return blockID == this.blockID;
+        else if (metadata == ALGAE)
+            return blockID == Block.waterStill.blockID;
         else
             return blockID == Block.grass.blockID || blockID == Block.dirt.blockID || blockID == Block.tilledField.blockID;
     }
@@ -90,7 +106,8 @@ public class BlockBOPFoliage extends BlockFlower implements IShearable
     @Override
     public boolean canBlockStay(World world, int x, int y, int z)
     {
-        return (world.getFullBlockLightValue(x, y, z) >= 8 || world.canBlockSeeTheSky(x, y, z)) && this.canThisPlantGrowOnThisBlockID(world.getBlockId(x, y - 1, z), world.getBlockMetadata(x, y, z));
+        return (world.getFullBlockLightValue(x, y, z) >= 8 || world.canBlockSeeTheSky(x, y, z)) 
+                && this.canThisPlantGrowOnThisBlockID(world.getBlockId(x, y - 1, z), world.getBlockMetadata(x, y, z));
     }   
     
     @Override
@@ -98,6 +115,10 @@ public class BlockBOPFoliage extends BlockFlower implements IShearable
     {
         super.onNeighborBlockChange(world, x, y, z, neighborID);
         this.checkFlowerChange(world, x, y, z);
+        if (world.getBlockMetadata(x, y, z) == GRASSTOP && world.getBlockId(x, y - 1, z) == this.blockID && world.getBlockMetadata(x, y - 1, z) != GRASSBOTTOM)
+                world.setBlockToAir(x, y, z);
+        if (world.getBlockMetadata(x, y, z) == GRASSBOTTOM && world.getBlockId(x, y + 1, z) != this.blockID)
+            world.setBlockToAir(x, y, z);
     }
     
     @Override

src/minecraft/biomesoplenty/blocks/BlockBOPPlant.java

@@ -91,15 +91,8 @@ public class BlockBOPPlant extends BlockFlower implements IShearable
             list.add(new ItemStack(blockID, 1, i));
     }
     
-//    @Override
-//    public boolean canPlaceBlockAt(World world, int x, int y, int z)
-//    {
-//        return true;//super.canPlaceBlockAt(world, x, y, z) && this.canThisPlantGrowOnThisBlockID(world.getBlockId(x, y - 1, z), world.getBlockMetadata(x, y, z));
-//    }
-    
     protected boolean canThisPlantGrowOnThisBlockID(int id, int meta)
     {
-        // TODO 
         switch (meta)
         {
             case 0: // Dead Grass

src/minecraft/biomesoplenty/items/ItemBOPFlower.java

@@ -1,9 +1,12 @@
 package biomesoplenty.items;
 
 import net.minecraft.block.Block;
+import net.minecraft.entity.Entity;
+import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.item.ItemBlock;
 import net.minecraft.item.ItemStack;
 import net.minecraft.util.Icon;
+import net.minecraft.world.World;
 
 public class ItemBOPFlower extends ItemBlock
 {
@@ -33,4 +36,64 @@ public class ItemBOPFlower extends ItemBlock
     {
         return Block.blocksList[this.itemID].getIcon(0, meta);
     }
+    
+    @Override
+    public boolean onItemUse(ItemStack itemStack, EntityPlayer player, World world, int x, int y, int z, int side, float hitX, float hitY, float hitZ)
+    {
+        int id = world.getBlockId(x, y, z);
+
+        if (id == Block.snow.blockID && (world.getBlockMetadata(x, y, z) & 7) < 1)
+            side = 1;
+        else if (!Block.blocksList[id].isBlockReplaceable(world, x, y, z))
+        {
+            if (side == 0)
+                --y;
+
+            if (side == 1)
+                ++y;
+
+            if (side == 2)
+                --z;
+
+            if (side == 3)
+                ++z;
+
+            if (side == 4)
+                --x;
+
+            if (side == 5)
+                ++x;
+        }
+
+        if (!player.canPlayerEdit(x, y, z, side, itemStack))
+        {
+            return false;
+        }
+        else if (itemStack.stackSize == 0)
+        {
+            return false;
+        }
+        else
+        {
+            if (world.canPlaceEntityOnSide(this.getBlockID(), x, y, z, false, side, (Entity)null, itemStack))
+            {
+                Block block = Block.blocksList[this.getBlockID()];
+                int j1 = block.onBlockPlaced(world, x, y, z, side, hitX, hitY, hitZ, 0);
+
+                if (world.setBlock(x, y, z, this.getBlockID(), itemStack.getItemDamage(), 3))
+                {
+                    if (world.getBlockId(x, y, z) == this.getBlockID())
+                    {
+                        Block.blocksList[this.getBlockID()].onBlockPlacedBy(world, x, y, z, player, itemStack);
+                        Block.blocksList[this.getBlockID()].onPostBlockPlaced(world, x, y, z, j1);
+                    }
+
+                    world.playSoundEffect((double)((float)x + 0.5F), (double)((float)y + 0.5F), (double)((float)z + 0.5F), block.stepSound.getPlaceSound(), (block.stepSound.getVolume() + 1.0F) / 2.0F, block.stepSound.getPitch() * 0.8F);
+                    --itemStack.stackSize;
+                }
+            }
+
+            return true;
+        }
+    }
 }

src/minecraft/biomesoplenty/items/ItemBOPFoliage.java

@@ -1,11 +1,15 @@
 package biomesoplenty.items;
 
 import net.minecraft.block.Block;
+import net.minecraft.block.material.Material;
 import net.minecraft.client.renderer.texture.IconRegister;
+import net.minecraft.entity.Entity;
 import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.item.ItemBlock;
 import net.minecraft.item.ItemStack;
+import net.minecraft.util.EnumMovingObjectType;
 import net.minecraft.util.Icon;
+import net.minecraft.util.MovingObjectPosition;
 import net.minecraft.world.World;
 import cpw.mods.fml.relauncher.Side;
 import cpw.mods.fml.relauncher.SideOnly;
@@ -52,29 +56,105 @@ public class ItemBOPFoliage extends ItemBlock
         return textures[meta];
     }
     
+    public ItemStack onItemRightClick(ItemStack itemStack, World world, EntityPlayer player)
+    {
+        if (itemStack.getItemDamage() != 0)
+            return super.onItemRightClick(itemStack, world, player);
+
+        MovingObjectPosition movingobjectposition = this.getMovingObjectPositionFromPlayer(world, player, true);
+
+        if (movingobjectposition == null)
+            return itemStack;
+        else
+        {
+            if (movingobjectposition.typeOfHit == EnumMovingObjectType.TILE)
+            {
+                int i = movingobjectposition.blockX;
+                int j = movingobjectposition.blockY;
+                int k = movingobjectposition.blockZ;
+
+                if (!world.canMineBlock(player, i, j, k))
+                    return itemStack;
+
+                if (!player.canPlayerEdit(i, j, k, movingobjectposition.sideHit, itemStack))
+                    return itemStack;
+
+                if (world.getBlockMaterial(i, j, k) == Material.water && world.getBlockMetadata(i, j, k) == 0 && world.isAirBlock(i, j + 1, k))
+                {
+                    world.setBlock(i, j + 1, k, itemStack.itemID, 0, 2);
+
+                    if (!player.capabilities.isCreativeMode)
+                    {
+                        --itemStack.stackSize;
+                    }
+                }
+            }
+
+            return itemStack;
+        }   
+    }
+    
     public boolean onItemUse(ItemStack itemStack, EntityPlayer player, World world, int x, int y, int z, int side, float hitX, float hitY, float hitZ)
     {
-        
+        if (itemStack.getItemDamage() == 0)
-        if (itemStack.getItemDamage() != 3)
-        {
             return super.onItemUse(itemStack, player, world, x, y, z, side, hitX, hitY, hitZ);
+                    
+        int id = world.getBlockId(x, y, z);
+
+        if (id == Block.snow.blockID && (world.getBlockMetadata(x, y, z) & 7) < 1)
+            side = 1;
+        else if (!Block.blocksList[id].isBlockReplaceable(world, x, y, z))
+        {
+            if (side == 0)
+                --y;
+
+            if (side == 1)
+                ++y;
+
+            if (side == 2)
+                --z;
+
+            if (side == 3)
+                ++z;
+
+            if (side == 4)
+                --x;
+
+            if (side == 5)
+                ++x;
+        }
+
+        if (!player.canPlayerEdit(x, y, z, side, itemStack))
+        {
+            return false;
+        }
+        else if (itemStack.stackSize == 0)
+        {
+            return false;
         }
         else
         {
-            ++y;
+            if (world.canPlaceEntityOnSide(this.getBlockID(), x, y, z, false, side, (Entity)null, itemStack))
-            
-            if (!(player.canPlayerEdit(x, y, z, side, itemStack) || player.canPlayerEdit(x, y + 1, z, side, itemStack)))
-                return false;
-            else if (world.getBlockMaterial(x, y, z).isReplaceable() && world.getBlockMaterial(x, y + 1, z).isReplaceable())
             {
-                world.setBlock(x, y, z, itemStack.itemID, 3, 2);
+                Block block = Block.blocksList[this.getBlockID()];
-                world.setBlock(x, y + 1, z, itemStack.itemID, 6, 2);
+                int j1 = block.onBlockPlaced(world, x, y, z, side, hitX, hitY, hitZ, 0);
-                world.notifyBlocksOfNeighborChange(x, y, z, itemStack.itemID);
+
-                world.notifyBlocksOfNeighborChange(x, y + 1, z, itemStack.itemID);
+                if (world.setBlock(x, y, z, this.getBlockID(), itemStack.getItemDamage(), 3))
-                Block block = Block.blocksList[itemStack.itemID];
+                {
+                    if (itemStack.getItemDamage() == 3 && world.getBlockMaterial(x, y + 1, z).isReplaceable())
+                        world.setBlock(x, y + 1, z, this.getBlockID(), 6, 2);
+                    
+                    if (world.getBlockId(x, y, z) == this.getBlockID())
+                    {
+                        Block.blocksList[this.getBlockID()].onBlockPlacedBy(world, x, y, z, player, itemStack);
+                        Block.blocksList[this.getBlockID()].onPostBlockPlaced(world, x, y, z, j1);
+                    }
+
                     world.playSoundEffect((double)((float)x + 0.5F), (double)((float)y + 0.5F), (double)((float)z + 0.5F), block.stepSound.getPlaceSound(), (block.stepSound.getVolume() + 1.0F) / 2.0F, block.stepSound.getPitch() * 0.8F);
                     --itemStack.stackSize;
                 }
+            }
+
             return true;
         }
     }

src/minecraft/biomesoplenty/items/ItemBOPPlant.java

@@ -56,6 +56,7 @@ public class ItemBOPPlant extends ItemBlock
             return Block.blocksList[this.itemID].getIcon(0, meta);
     }
     
+    @Override
     public boolean onItemUse(ItemStack itemStack, EntityPlayer player, World world, int x, int y, int z, int side, float hitX, float hitY, float hitZ)
     {
         int id = world.getBlockId(x, y, z);