BAC wrote:

I have grown 'American land cress' from Suttons seeds - I think you can
still get it. Very peppery, goes well in sandwiches, ready a couple of
months after sowing (from early spring onwards). As easy to grow as a weed.

I've grown that before and definitely concur. I should get some more.

We have watercress that grows in the yard where a couple of springs wash
through it. I've never been sure about eating it though, as it's not
all that far away from the septic tank soakaway and there can't be many
other sources of water during the summer.

James