Open windows, bowls of ripening fruit and long, balmy (or indeed, sweltering) evenings are just some of the joys of summer. Alas, they're also an open invitation to every winged and crawling creature for miles around. Before reaching for the chemical sprays, though, it is worth remembering that there are plenty of gentler, natural ways to discourage unwanted visitors – and many of them can even make your home smell pretty nice, too.