Water Soldier Stratiotes Aloidesthis Is A Useful And Efficient Oxygenating Plant With Spreading Clumps Of Spiky Leaves. Water Soldiers Over Winter At The Bottom Of The Pond To Reappear Every Spring.floating Plants Shade The Pond And Reduce Algae While Providing Valuable Cover For Pond Life. these Plants Float On Top Of The Waterheight 10cm4in.spread 30cm12in. flowers June august