Autumn is the time to collect seeds of garden plants. the most cost-effective way of propagating perennials. Hannah talks us through various types of seed, and how they need to be cleaned and processed prior to sowing; and then the business of seed sowing itself. She goes on to look at the propagation of a fern which produces bulbils on its fronds, the taking cuttings of shrubby salvias and the subsequent potting on of rooted cuttings