Liberty Sunset Garden Center is a really awesome place. It's a little sloppy and make-shifty and it's a little hard to find, but once you're there - it's impressive. It really is a hobbiests workshop and most of the tropicals are almost too big to even think about buying but the smaller items are decently priced and they have a really beautiful selection of Columbian pots. As far as outdoor perennials go I suggest the Gowanus nursery because I think that Liberty Sunset is mostly about indoor horticulture. They also had some really nice hydroponically grown vegetables. Definitely worth a trip again when it warms up.