I go to 14th Street garden center. I used to avoid it thinking parking would be a pain but there's always parking on the street to the north. Knowledgeable workers, quality selection, and large enough that the prices are reasonable. It's not as cheap as Lowe's or home Depot but not as pricey as the smaller high quality shops. I used to go to home Depot and you can tell the plants at 14th Street are cared for so much better. They will also pot them for you and help you bring large ones to your car.