The Green Gnome King is in the Green area of Infinity Time, and in Wave 9 is when it is first encountered.
Fighting the Green Gnome King can be very overwhelming. Try to take out the smaller Gnomes before you attack the Gnome King and don't collect their shards alone until you really need them. Once you have taken out the smaller Gnomes, head over to the bigger one and use one of your abilities. If you are at low health, once again, take out smaller Gnomes for their shards.
Gosh, I can grow leaves!
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