This is only my second year with water chestnuts. I've grown them in large (wide) pots and directly in media in the pond. In both cases they formed dense mats of roots and leaves and the new corms grew among them. I found they grew faster with more sun, and could handle our brutal heat as long as they were well covered in water. Some that I kept as controls did manage okay in the shade, but hardly spread and produced no new corms to speak of.
