We used the aluminum type the first year with the Demon Pond, couldn't
hardly make them out the next year. Personally I used the white plastic
tags a little bigger than a popsicle stick, write on it with permanent
marker and stick the name below the dirt.... if one has plasticware on
hand, white knives work well also. ~ jan

I am looking for a source for aquatic plant tags.
I would prefer the aluminum type where one makes
a line with a stylus. But anything that will last
is OK.

(Do you know where your water quality is?)