Watercress is a good waterfall plant.
It takes off but is easy to rip out
when it needs to be reined in.
Mine survives the winter cold, snow, with the
waterfall turned off and loves the 100 degree temps we get here in the summer.
My water hyacinth in the filter did not do well this year (due to the poor
things getting dried out when the pump stopped and increased shade) so the
watercress took up the bulk of the filtering this year and the pond is very
clear.
(And it tastes good too!!)


kathy :-)
algae primer
http://hometown.aol.com/ka30p/myhomepage/garden.html