Ref GC001: The RHS Encyclopaedia of Herbs & Their Uses by Deni Bown (1996)

Is the most authoritative illustrated encyclopaedia of herbs yet produced. It covers over 1000 herbs grown worldwide for their culinary, aromatic, medicinal, and economic uses, as well as for their decorative qualities in the garden.
The book has been planned as a companion volume to the best-selling The RHS Gardeners' Encyclopaedia of Plants and Flowers, responding to the widespread contemporary interest in herbs and the ways in which they have been used since ancient times. This comprehensive reference work provides a wealth of information on herbs grown and used all over the world, for gardeners, herbalists, and cooks alike.
The book has been planned as a companion volume to the best-selling The RHS Gardeners' Encyclopaedia of Plants and Flowers, responding to the widespread contemporary interest in herbs and the ways in which they have been used since ancient times. This comprehensive reference work provides a wealth of information on herbs grown and used all over the world, for gardeners, herbalists, and cooks alike.
Ref GC018: The New Illustrated Gardening Encyclopaedia by Richard Sudell (Old!)

Ref GC061: Encyclopedia of Herb Gardening by Frances Hutchison (2004)

This book covers all aspectsof herb gardening, from planning and designing a garen to choosing herbs, improving the soil and planting, propogating and maintaining your herbs. There is also a handy information on using herbs in cooking, crafts, cosmetics, and gifts. With clear, comprehensive text, practical tips, and many lavish photographs, the Encyclopedia of Herb Gardening is the essential reference for anyone wishing to create a beautiful and productive herb garden.
Ref GC034: The Dictionary of Shrubs in Colour - RHS by RHS - S Millar Gault (1984)

Part of the purpose of this book is to show in colour some trees suitable for the smaller garden and also show, not only the beauty but the great diversity of shrubs which can be grown in all types of gardens. Large gardens are a minority group when compared with the ever increasing number of small gardens.
Ref GC059: The Container Gardening Encyclopedia by Sue Phillips (1999)

This encyclopedia explores the facinating and increasingly popular world of gardening in containers. Many people have limited room in which to create and enjoy a garden. For them, containers are the ideal choice. But even where pace is not at a premium, containers offer such a wide variety of creative planting opportunities that they should be a vital part of every garden.