The Big Bang Theory Season 4 Episode 20: The Herb Garden Germination

The Big Bang Theory Season 4 Episode 20 can be watched on Thursday on April 7, 2011 at 8:00pm EDT on WCBS (CBS) TV channel. Title of the brand new episode is: The Herb Garden Germination. Synopsis of the episode is: Amy and Sheldon spread gossip as part of an experiment; Howard decides to take a big step in his relationship with Bernadette.