Incorrect icon showing on subblocks.

I'm adding a sapling class with twelve different sub-blocks. The saplings show the correct texture when placed in the world, but when in the inventory they always show the icon of the first sapling.

I've checked and getIcon() is always being given a metadata value of zero. If I change meta to any other appropriate number then that sapling's icon is shown. I cannot figure out why this is happening. I do the exact same thing with my leaves and logs and it works great.

Sapling class:

package arrowsplus;

import java.util.List;

import net.minecraft.block.Block;
import net.minecraft.block.BlockFlower;
import net.minecraft.client.renderer.texture.IconRegister;
import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.item.ItemStack;
import net.minecraft.util.Icon;
import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;

public class BlockArrowTreeSapling extends BlockFlower
{
public static final String[] woodType = new String[] {"aspen", "cottonwood", "alder", "sycamore", "gum", "softmaple",
	"ash", "beech", "hardmaple", "hickory", "mahogany", "sypherus"};
    @SideOnly(Side.CLIENT)
    private Icon[] saplingIcon;

    protected BlockArrowTreeSapling(int par1)
    {
        super(par1);
        this.setCreativeTab(ArrowsPlus.instance.tabArrowsPlus);
        this.setTickRandomly(true);
    }

@Override
public Block func_111022_d(String par1Str)
{
	this.field_111026_f = "arrowsPlus:tree";
	return this;
}

    @SideOnly(Side.CLIENT)
    public Icon getIcon(int side, int meta)
    {
    	//-----------------> Meta is always zero.
        return this.saplingIcon[meta];
    }

    public int damageDropped(int meta)
    {
        return meta;
    }

    @SideOnly(Side.CLIENT)
    public void getSubBlocks(int itemId, CreativeTabs creativeTab, List listSubBlocks)
    {
	listSubBlocks.add(new ItemStack(itemId, 1, 0));
	listSubBlocks.add(new ItemStack(itemId, 1, 1));
	listSubBlocks.add(new ItemStack(itemId, 1, 2));
	listSubBlocks.add(new ItemStack(itemId, 1, 3));
	listSubBlocks.add(new ItemStack(itemId, 1, 4));
	listSubBlocks.add(new ItemStack(itemId, 1, 5));
	listSubBlocks.add(new ItemStack(itemId, 1, 6));
	listSubBlocks.add(new ItemStack(itemId, 1, 7));
	listSubBlocks.add(new ItemStack(itemId, 1, );
	listSubBlocks.add(new ItemStack(itemId, 1, 9));
	listSubBlocks.add(new ItemStack(itemId, 1, 10));
	listSubBlocks.add(new ItemStack(itemId, 1, 11));
    }

    @SideOnly(Side.CLIENT)
    public void registerIcons(IconRegister iconRegister)
    {
	this.saplingIcon = new Icon[woodType.length];
	for (int i = 0; i < this.saplingIcon.length; ++i)
	{
		this.saplingIcon[i] = iconRegister.registerIcon(this.func_111023_E() + "_" + woodType[i] + "_sapling");
	}
    }
   
}

They are registered as such in preInit()

		blockArrowTreeSapling = new BlockArrowTreeSapling(modPropertiesManager.modProperties.blockId_ArrowLogSapling).func_111022_d("tree");
	GameRegistry.registerBlock(blockArrowTreeSapling, ItemBlockSapling.class, "Arrow Saplings");

	for (int i = 0; i < 12; i++)
	{
		ItemStack saplingStack = new ItemStack(blockArrowTreeSapling, 1, i);
		LanguageRegistry.addName(saplingStack, saplingNames[i]);
	}

The ItemBlock for the saplings

package arrowsplus;

import net.minecraft.item.ItemBlock;
import net.minecraft.item.ItemStack;

public class ItemBlockSapling extends ItemBlock
{
public static final String[] saplingNames = new String[] {"Aspen Sapling", "Cottonwood Sapling", "Alder Sapling", "Sycamore Sapling", "Gum Sapling", "Soft Maple Sapling",
	"Ash Sapling", "Beech Sapling", "Hard Maple Sapling", "Hickory Sapling", "Mahogany Sapling", "Sypherus Sapling"};

public ItemBlockSapling(int id) 
{
	super(id);
	setHasSubtypes(true);
	setUnlocalizedName("ItemBlockSapling");
}

@Override
public int getMetadata(int damageValue) 
{
	ArrowsPlus.instance.log(damageValue);
	return damageValue;
}

    public String getUnlocalizedName(ItemStack par1ItemStack)
    {
        return saplingNames[par1ItemStack.getItemDamage()];
    }
}