We live in the Evergreen State, Washington. This seemed like an obvious choice for "E" so I double-checked my last A to Z Challenge to see if I used it then because the first 13 letters of the alphabet were garden themed. Surprisingly, I did not. I don't want to repeat my words from that challenge, but I kind of have already. Compare my A to D from 2011 (I will add the completion badge later when I'm on desktop) with now and see what I mean. I'm not doing your homework for you! Hint: your cheat sheet is my A to Z tag.
Back to Evergreens . . .
I grew up knowing that Washington is the Evergreen State. We have lots of evergreen trees. The state tree is the Western Hemlock (did Socrates pop in your head?). We have Douglas Firs everywhere. Beyond all the trees actually considered evergreen, we have lots of lush green scenery via other trees, bushes, shrubs, leafy flowers, etc.
Another E I could have used is Emerald City, as in one of Seattle's nicknames not Oz. Same premise for the city nickname as the state nickname--greenery. Seattle may get slack for rain but we also reap its benefits for beautiful natural surroundings.
Greenery in downtown Seattle. It's an urban jungle, not a concrete jungle. Speaking of concrete . . .