By Tonz
United Kingdom 
A couple of years ago I grew some Nasturtium , all started off well , but as the plants got larger they got smothered in black fly , I sprayed them but it didn't seem to help much , in the end pulled plants up as the back fly was starting to affect other plants . Are Nasturtium prone to flys ?
7 Jun, 2011
Answers
These plants are often grown near vegetables because the aphids will prefer the nasturtiums to the veggies, so have a protective effect. If you're going to use washing up liquid, make sure its an eco friendly one - ordinary liquid is as harmful as pesticides, if not more so.
8 Jun, 2011
Agree with other comments, have now given up on nasturtiums, much as I like them, find the constant blackfly too annoying, and you are right, they do spread to nearby plants.Now I plant pelargoniums where I want some reliable orange-y red colour, no problems there.
8 Jun, 2011
Thanks for the advice , think I will give them a miss then , too much trouble
8 Jun, 2011
They certainly are! I just ignore the blackfly, but you could either spray with a soap solution or have a squishing campaign if you don't want to use insecticide because of its harmful effects on bees and other beneficial insects.
7 Jun, 2011