Behnke Nurseries, a fixture in Potomac for 16 years, will close its River Road location at the end of the July 4th weekend. Behnke vice president Stephanie Fleming, whose grandparents started the company in 1930, says the Potomac lease was up for renewal “and the cost of staying on that property simply didn’t make business sense anymore.” Fleming says she hopes Behnke’s loyal customers will consider making the half-hour trip to its flagship location in Beltsville, where they’ll find “eleven acres with plenty of parking, greenhouses under cover, and lots of seminars and events.”