The people who developed the grafted plants were the Israelis. They developed them because they don't have water. They graft watermelons, cantaloupes, cucumbers, and all of these plants.
Grafted plants cost about four times more than a non-grafted plant, so it's very substantial as far as that goes. We'll get that down, but in any event, one of the things they discovered is that these roots can go down to a metre deep, whereas the conventional roots only go down six inches. So you've got a lot more area that you can tap into, and they do find that it's much more resistant to drought.