Crafting with grass

I was wondering how to craft grass, in bukkit there is only one type of grass (This: ) I want to craft with the walk-through-able grass that looks similar to this: . I also would like to make this craft a double plant, in this case double tall grass. Here is my current code:

ShapedRecipe craftDoubleGrass = new ShapedRecipe(new ItemStack(Material.DOUBLE_PLANT, (short) 2)).shape(" G ", " G ", " ").setIngredient('G', Material.GRASS);

This code adds the crafting recipie of this:
Crafts into a sunflower.

I tried to make this as least confusing as possible. It's hard to tell what grass i am talking about because they are both named grass. If it helps i want to craft 2 of the grass of ID:31/1 into double plant (double tall grass) ID:175/2 Thank you for any help.

 

(Removed)

 

The Material is LONG_GRASS

 

That helped, but not it's 31/0. Is there any way i can make it's ID 31/1? using the short method isn't working when using it on the crafted item, it just yields that many of the item rather than checking for the item data.

 

You would have to check with the
http://docs.codelanx.com/Bukkit/1.7.10/org/bukkit/event/inventory/PrepareItemCraftEvent.html or
http://docs.codelanx.com/Bukkit/1.7.10/org/bukkit/event/inventory/CraftItemEvent.html

I haven't used any of those events so I don't know which one would be most relevant.