Oak and Ash leaves are thought to be omens of summer weather. If you need some rain then hope that the ash comes into leaf first; little rain, then hope for the oak. Rain is also thought to be on the way if you hear leaves rustle or see the underneath of the leaf turned upwards. Too many leaves falling before autumn has officially arrived is an ill omen, so too when leaves wither quickly when brought into the house. If you can catch a leaf as it falls you should be lucky enough not to catch a cold during the winter, and if caught between Michaelmas (29 September) and Hallowe'en (31 October) the following year should be a prosperous one.