I have Dwarf Sagittaria. It's been in for 2 yrs. My only complaint, it doesn't spread fast enough!
I would be very careful selecting water lillies. Some can be
VERY invasive! I have 15 different variaties in my pond. I suggest buying from someone that knows the plant & it's growing charateristics. Here's where I get mine:
http://www.members.aol.com/abdavisnc/swglist.htmlAndrew used to post on PB, don't know if he's been around lately.