I'm on the email list for updates on community gardens in Montgomery County, and the email update that I received today had some promising news for gardeners in Wheaton. There is a community garden being proposed near Wheaton Regional Park along Kemp Mill Road. A meeting is scheduled on October 21st, 7:00-8:30pm at 11721 Kemp Mill Rd (Silver Spring Center/Randolph Academy) to share a powerpoint presentation about the proposed plans and gather input from the community. The meeting will be held in the large meeting room in the school at that location.
I would have to drive to this garden since it's not quite close enough to walk to from my house, but it's still encouraging to see a possible community garden coming to the Wheaton area. Information about existing community gardens in the county is available here.