April is National Garden Month, and whether or not you have a green thumb, you can stop and smell the MUSICAL flowers this weekend. Stroll through a magnificent harmonic garden cultivated by musicians with particularly fertile imaginations and creativity. It’s on Sunday Baroque this weekend, starting at 7 a.m. on 91.1, 107.5 and wshu.org, and at 10 a.m. on 89.9.