Hi ponders. I need to fill a spot in my stream that is kind of a dead area and I thought a plant would be the nicest option. There are some caveats though. It needs to be between 12" and 20" tall, not a wander (stays compact), and shade to partial shade (gets about 3 hours of morning sun). Bonuses things I'm looking for is something that likes having it's crown submerged, prefer hardy and not an acidic/soft water lover ( pH is 8.2, GH and KH are 6ish). I am considering something like impatiens too. I've done them in a QT pond that was close to this location and they did amazing. Looking forward to your suggestions!