With spring here, lots of green things to do this weekend.

Baltimore Green Week wraps up on Saturday, with a flurry of activities:

8:30 a.m. - 12:30 p.m., there'll be tours and workshops at Real Food Farm, where the group Civic Works is growing produce on six acres in northeast Baltimore's Clifton Park, 2801 St. Lo Drive. Go here or call 410-366-8533 for info.

8 a.m. - 9:30 a.m., there'll be a guided bird-watching walk for all ages through Patterson Park. Led by the Audubon Society's conservation director. Meet at the fountain in Patterson Park closest to E. Lombard St. and S. Patterson Park Ave. If you don't have binoculars and would like to borrow some, email  ppaudubon@gmail.com

10 a.m. - 12 noon. there'll be a wildlfower walk at Herring Run Park, with Vince Vizachero of the Maryland Native Plant Society as leader. Meet at the Herring Run Trail & Chesterfield Avenue, 2212 Chesterfield Ave.

11 a.m. - 2 p.m. Dia del Nino Children's Day.  Audubon and local groups will hold a bilingual family festival at the Patterson Park Pagoda, with kids' activities, nature hikes and environmental education games.

If you'd rather go green in southern Maryland, there's Calvert County's 4th annual Green Expo on Saturday, April 28, 10 a.m. - 5 p.m.. at the AnnMarie Sculpture Garden and Arts Center, 13480 Dowell Road, Dowell MD. Free.