It'll grow in moist soil or in water 6 inches deep or more. It's hardy in zone 3.

Brenda

The net can be confusing on this plant. Some sites call it broadleaf arrowhead, which is what I have, and some call it duck potato, which has different leaves. My arrowhead I put in pots and set in 6-8" of water. If you plant it in a pot, use a 2 gallon pot as it will send down the "potatoes" in the Fall to produce new plants in the Spring.

Happy ponding,
Scott