Super Plant Growth Formula
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Not a whole lot is revealed about Super Plant Growth Formula, except that Dr. Toby invented it and that it can be used to save dying plants. However, when Mario sprinkles too much onto Mama Mario's dying basil bush, it causes the bush to grow into a Super Plant.
Dr. Toby also came up with an antidote for Super Plant Growth Formula, which he used to shrink Super Plant back down a basil bush.