Posted: 09/01/2014 at 11:56
I wouldn't use salt water!!!
The mild winter is encouraging lots of weed seeds to germinate early - they keep coming up because lots of seeds have been scattered there. What plants are there in the vicinity that shed a lot of seeds? In my garden there are lots of foxglove seedlings all over the place.
Maybe something your friend grew there last summer has shed seeds which are germinating now.