Does lifesteal grant you life when you damage turrets, or only against minions, champions, that sort of thing?
Only minions, champions, and that sort of thing.
Unless you're using Udyr's Turtle stance. That's not exactly lifesteal but is the same idea.
© 2014 Riot Games, Inc. All rights reserved. Riot Games, League of Legends and PvP.net are trademarks, services marks, or registered trademarks of Riot Games, Inc.