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A Plant dragon.
Breed plant and plant.
Water dragon.
Blazing+plant
Plant and Cold
Metal & Plant
Plant Dragon and Cold Dragon
To date, there is no grass dragon in DragonVale. You may be thinking of the plant dragon. See the related question.
Mine+ plant breed the evergreen and metal Forge+plant
You get a plant dragon.
90% moss
You have to breed a plant and a fire dragon.