The Propagator's Handbook by Peter Thompson
Containing straightforward practical advice on dividing plants, sowing seeds and taking cuttings, this book aims to arm even complete beginners with the confidence to have a go, and to allow the gardener freedom to plan and plant lavishly and imaginatively, without counting the cost. All kinds of garden plants are covered - annuals, biennials, herbaceous perennials, ferns, bulbs, alpines, conservatory plants, shrubs, climbers and even trees. Each short section describes one simple method of propagation and growing on - how to do it, what will be needed, a list of the plants for which it works, and details of what can go wrong and the remedies.