The Corned Beef King food truck has a new home in Potomac: the parking lot of Potomac Petals and Plants, the nursery that replaced Behnke at 9545 River Road. Truck owner Jon Rossler says he gave up his previous spot at a Falls Road swim club after too many altercations with an unhappy neighbor. At the nursery, he’s serving up a varied menu with matzoh ball soup, knishes and lobster rolls. But in Potomac, he says, most customers are looking for the basics: “plain corned beef on rye with mustard” is far and away the best-sell
