Hi..

Check with Bonnie in NJ. She has had celery for an age.

Well colloquial names are nothing but smoke an mirrows..

For example there's a big difference between European and
American watercress. The European watercress is a cress but
the American watercress is a Water Horseradish..

Read once a pond article about the Eurasian V. spiralis that
overwintered in a Middle European pond in a depth of 70 cm
(= 28"). The pond owner removed snow on ice so the vals got
enough light to survive..

P.S.: In aquaria vals might sometimes be confused with sags
(mostly Sagittaria subulata). Sags also have different
looking emerged leaves but vals do always live a submersed
life..
--
cu
Marco