wpostServer: http://css.washingtonpost.com/wpost

Creeping into spring

Temperatures and rainfall can cause normal shifting of bloom dates for native plants in the D.C. metro area, but the shift for some species has changed significantly over the past four decades.

Temperatures and rainfall can cause normal shifting of bloom dates for native plants in the D.C. metro area, but the shift for some species has changed significantly over the past four decades.
SOURCES: National Weather Service; Sylvia Orli, Smithsonian Institution; National Park Service. Cristina Rivero and Patterson Clark/The Washington Post. Published on April 8, 2011, 8:51 p.m.
 
Read what others are saying