You can't. They have to be at least level 4
There is no such thing as a ground dragon its an earth dragon. They have to be level 4 or higher. 25%clover 30%tree 45%moss
it could be anytghing
There is no "marsh" dragon in dragonvale but if you are referring to the moss dragon the best way to get it is earth and plant, although you also have a chance to breed the tree dragon.
A Plant dragon.
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.
You have to breed a plant and a fire dragon.
Earth dragon and plant drago tip go to eggs and look at the dragon you want and underneath the dragon will be 2 sighns so if it is eart and cold bread them in the right order then you will have that dragon ok bye
You would either get a plant dragon or another moss dragon.
Plant and Cold
Metal & Plant
I got it by using a Lightning and Plant Dragon.