There's so much good stuff on the calendar this week -- from fern ID on Tuesday night, to Fern Valley on Sunday -- that it was hard to choose a few picks... but the last Friday in April is Arbor Day, and that wins out.
If you're thinking of actually planting a tree for Arbor Day, wait a day: the largest native plant sale we know of in the Washington, DC area is on Saturday in Alexandria. Though we tend to order wholesale for our native plant landscaping business (and propagate a lot ourselves), there are a couple of things we're looking for that will get us to make the trip around the beltway this weekend. The sale website has a list of vendors -- you can call them ahead of time if you, too, are looking for a certain plant...or just head on over and take a look.
Want to just get out and appreciate the trees? Rock Creek Park is offering several Arbor Day themed hikes on Friday and Saturday. The "Edge of the Woods" hike is for ages 3 and up along the short trail by the Nature Center; there's a longer (2-mile) "Forest for the Trees" hike on Saturday afternoon.