The Botany Shop is probably the largest nursery in the area. They have a lot of trees, plants, flowers etc., as well as a large selection of mulch and pretty much everything else a landscaper of do it your selfer would need. They do not have the best prices though, at least on what I have needed. The people are nice enough, but there never seems to be enough of them to go around.
The location is great, but if you have the time, shop around before you buy.