A household of two people can quite happily survive on the output of two courgette plants over the growing season. When you plant eight, for safety, you do not need to 'keep the other six plants because it seems a shame to waste them' because you WILL be looking up as many recipes for courgette chutney as you can find,making cakes, soups, even brownies, giving away courgettes to neighbours, replacing aubergines in recipes with courgettes, thinking of letting some of them grow into marrows, looking up marrow chutney recipes, trekking down to the village shop with four carrier bags of courgettes just to get rid of them, looking for tips on how to freeze them in as small a space as possible etc, for about three to four weeks. This does not have to be an annual event.