Just some side thoughts. Some of the vegetation I plant are in deeper water. I place the roots in a clay ball and drop them in water too deep to hand plant. If any of your hardies can grow in deeper water it might keep them away from deer if they may be causing you problem. I know hardy lilies are a little expensive to just be tossing them in like that. I planted yellow's, pink's and red's 15 years ago. The yellows disappeared after 5 years, the pink's didn't show a flower for the first time this year but the red's are still going strong. My pink was Pink Sensation if I remember right and with 15 years of growth the pads were only about 7 feet in diameter spread. The red's about 20 feet dia.
