Don't have a yard? Don't have a deck? Don't even have a stinkin' sunny windowsill? You can still get your plant on!
Seriously. There is no excuse for not getting elbow-deep in gardening, *if* you want to do it. (I don't judge those that aren't as...um...geeked out by plants as I am!) In the DC area, we are lucky to have lots and lots of parks, county gardens, and even community gardens. So, there's plenty of opportunities to volunteer!
Let's start with Arlington and NoVA:
Arlington Community Gardens. Word on the street is that these have a long waiting list so sign up ASAP!!
Northern Virgina Regional Parks Volunteers. Meadowlark Botantical Gardens in Vienna, Potomac Overlook Park in Arlington, and Uphill Regional Park all have volunteer opportunities that involve gardening. And, if you enjoy gardening & haven't been to Meadowlark...GO! It's great to get landscaping ideas as well as good photo opps for macro photography.
Check out Idealist.org for additional opportunities! Here's one on helping landscape an Arlington library. Also check out your county/city's webpage; Arlington has a site dedicated to volunteer opportunities, both gardening & not. Alexandria and Reston have something similar.
And, to not be a snotty Arlingtonian, here's some resources for DCers:
DC Community Gardens