SWWLTBO is in the habit of buying these "fresh and still growing" salad leaves and herbs in pots with which she adorns the kitchen window ledges. They invariably die before she remembers to use them. The latest batch, purchased last week, have given rise to squadrons of small black flies, slightly larger than your average fruit fly but in all other ways very similar. Looking at the label I see that the culprit seems to be parsley from Spain. I wonder what dread insect she has unwittingly let loose on North Wales?