Grow your own Kohlrabi with this video tutorial from Quickcrop and veg growing expert Klaus Laitenberger. Kohlrabi sports a rosette of blueish-green leaves above a swollen stem. Depending on the variety the edible swollen stem can be green, white or purple. Kohlrabi is easy to grow, nutritious and it tastes good too! If you like celery, you will like it's celery like, nutty flavor. Best of all, it is perhaps the hardiest of garden vegetables, and will grow long after your other garden vegetables have succumbed to the cold and frost.