That's no good in my light soil so I went for the other option - grow 4 (ish) plants in a large pot which you place on a large pot saucer and keep well topped up with water.
After 6 weeks I had my first pickings and now they are growing really fast and there's always some to add to a salad.
I'm really chuffed as I had never realised you could grow it like that - with the benefit that there's no shrimps in mine (or fluke)!!!!
