Columbia Heights farmer’s market – I think it is Chelsea Farms? They have the best assortment of veggies & plants. I’ve bought seedlings from them past 3 years and all have been superb. Plus, the guy will really tell you about the plants – what kind of tomato do you like? Sweet? Tart? Beefy? Etc. Like a veggie psychiatrist. Doesn’t try to force or upsell you either. First year I was looking for cucumber plants, he said – hell, just stick some seeds in the ground, they’re easy to grow. (They are!) I’m still buying my tomato plants from them – and sinfully delicious little eggplants. Seriously – like eggplant flavored sticks of butter.