Not that I am aware of Great but they will trail into the pond.

Will they do any harm to the pond MG?

Not really, Great, but the leaves may well rot in the water. Which nasturtiums did you buy? Were they climbers or trailers or one of the small, bushy varieties like Alaska mixed or Empress of India?

ive never known nasturtiums grown in a pond and ive lived in the countryside for the last 48 years.
Perhaps they got confused with water lilies (ie the leaves)

is it mimulus that thrive in shallow water ?

I don't know Pamg

just googled I think you've cracked it pamq

pleased about that Great! -- they look a bit like nasturtiums but are more spotty ( i think )

otherwise called monkey flowers, some have spots, thanks again