What can be more convenient than being able to nip into the garden to pick some salad for lunch, some herbs for the pot or some fresh veg or fruit for dinner? Nothing beats the flavour of home-grown produce, or, in these days of additives and preservatives, the reassurance of knowing what is in your food. Contrary to popular belief, you don't need an enormous garden, or a dedicated spot within it to grow your own, nor do you need to join the mammoth...