Honor Spring’s rebirth at two Sunday events. Avena Botanicals and Rebel Hill Farm holds its annual Mother’s Day Perennial Plant Sale and Garden Walk from 12:00 to 3:00 p.m.. Shop for organic, field-grown plants, and take a free herb walk at 1:30. 219 Mill St., Rockport; 207-584-0694; www.avenabotanicals.com .