I bought some from Morrisons Salad shelf (chopped up in a bag no roots)
about six weeks ago for my waterfall intermediate pond.

Put a handful in (ate the rest) and it rooted within days. It is 12 inches
tall now and about to flower. I seriously have to think about removing some
as it is taking over.

Where to get some: Tesco, Asda, Sainsburys,etc

Just throw it in and watch it grow, literally by the hour.

It does prefer moving water so your stream location is ideal.

Roots take loads of nutrients out of the water, so it is ideal plant for
starving algae and preventing a bloom.

Hope this helps

FrankG

West Midlands
UK

P.S. Do not eat it when it has grown in the pond. It could contain Liver
flukes and give you Liver failure !!

"NSF" wrote in message
. ..


Any suggestions as to where I can buy some watercress to plant in my
stream?
I am in North West London/Herts.