Worth a visit even if you don't like buying vegetables, like myself. I went mostly to purchase some BLAZE hot sauce, which is amazing. At $8.95 a bottle, you can get flavors like mango habanero, avacado jalepeno, hot curry and more. Delicious and flavorful.
Tremont Digs also has a stand and there's some really cool, unique plants here. A couple other vendors have small plants for sale, mostly herbs.
There's some great people watching here in Lincoln park, too. Hula hoopers are always fun to watch, especially adults.