Someone from the Emerald City might find this one easier

You cannot solve this one until you see it in a different light

To solve this puzzle, you need to see green

Go to the greenhouse and take the elevator up to the green-colored room. (Note: This might not be the easiest floor to reach.)

Look out the window here at the flowers just outside. When viewed through the green-colored glass, the different colored flowers now form a solid path. The shape should be pretty easy to find.

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The puzzle is made up of different colored flowers

You will find this one while indoors

The puzzle itself is outdoors

Look in and around the greenhouse area (aka the "Bunker")