| Rating | Book | Author |
| R is for Rose: Reflections from a Passionate Rose Lover | Carolyn Parker |
 (1) | Rabbit Hill | Robert Lawson |
| Radical Regenerative Gardening and Farming | Frank Holzman |
| (1) | Rain Gardening in the South: Ecologically Designed Gardens for Drought, Deluge & Everything in Between | Helen Kraus |
| Rain Gardens: Managing Water Sustainably in the Garden and Designed Landscape | Nigel Dunnett |
| Rainwater Harvesting for Drylands and Beyond, Volume 1: Guiding Principles to Welcome Rain Into Your Life and Landscape | Brad Lancaster |
| (2) | Raising Beautiful Dahlias the Easy Way | Dr. Richard Peters |
| (1) | Raising Chickens | Cynthia Haynes |
| Raising Poultry the Modern Way (Revised & Updated) | Eileen Powell |
| Ramblings of a Garden Addict | Sarah Matay |
| (2) | Random House Book of Perennials: Late Perennials | Roger Phillips |
| (1) | Rare and Unusual Plants for New Zealand Gardens | Geoff Bryant |
| Rare Plants of Colorado | Colorado Native Plant Society |
| Raspberry and Blackberry Production Guide for the Northeast, Midwest, and Eastern Canada | Lori Bushway |
| (4) | Reader's Digest Complete Book of the Garden | Thomas H. Everett |
| Reader's Digest Crops in Pots: How to Plan, Plant and Grow Vegetables, Fruits and Herbs in Easy-Care Containers | Bob Pumell |
| Reader's Digest Great Garden Designs | Tim Newbury |
| Real Food: What to Eat and Why | Nina Planck |
| Reap a Wicked Harvest (Bretta Solomon Gardening Mysteries) | Janis Harrison |
| Redesigning the American Lawn: A Search for Environmental Harmony | F. Herbert Bormann |
| (1) | Redoute's Roses | Pierre-Joseph Redoute |
| Reflecting Nature: Garden Designs for Wild Landscapes | Jerome Malitz |
| Reinvent Your Garden: Simple Steps for Garden Makeovers | Pamela Cornelison |
| Reluctant Gardener: A Beginner's Guide to Gardening in Canada | Edwinna Von Baeyer |
| (1) | Remains of a Rainbow: Rare Plants and Animals of Hawaii | David Liittschwager |
| (1) | Remarkable Trees of the World | Thomas Pakenham (photographer) |
| (1) | Remembered Gardens: Eight Women and Their Visions of an Australian Landscape | Holly Kerr Forsyth |
| Residential Landscape Architecture: Design Process for the Private Residence, 3rd Ed. | Norman K. Booth |
| Restoring American Gardens: An Encyclopedia of Heirloom Ornamental Plants | Denise Wiles Adams |
| (1) | Restoring The Tallgrass Prairie: An Illustrated Manual for Iowa and the Upper Midwest | Shirley Shirley |
| Retaining Walls: A Building Guide and Design Gallery | Tina Skinner |
| Rhododendron Hybrids (2nd edition) | Homer E. Salley |
| Rhododendron Portraits | D.M. van Gelderen |
| Rhododendrons in the Landscape | Sonja Nelson |
| (1) | RHS Plants for Every Season: 1,000 Recommended Plants for Colour All Year Round | Martin Page |
| RHS What Plant When | |
| Rhubarb: More than Just Pies | Sandi Vitt |
| (2) | Right Plant, Right Place | Nicola Ferguson |
| Right Plant, Right Place (Gardening Essentials) | Jackie Matthews |
| (2) | Right Rose, Right Place | Peter Schneider |
| Rikugien, a Japanese Garden | Anika Ogusu |
| Roadside Wildflowers: An Introduction to Familiar North American Species | James Kavanagh |
| Rock and Water Gardening (Time-Life Encyclopedia of Gardening series) | James Underwood Crockett |
| Rock and Water Gardens | Peter McHoy |
| Rock Garden and Its Plants: From Grotto to Alpine House | Graham Stuart Thomas |
| Rock Garden Design and Construction | North American Rock Garden Society |
| (1) | Rock Garden Plants - A Color Encyclopedia | Baldassare Mineo |
| (1) | Rock Gardening: A Guide to Growing Alpines and Other Wildflowers in the American Garden (2nd edition) | H. Lincoln Foster |
| Rock Gardens: How to make and Maintain Them | Lewis B. Meredith |
| Rocky Mountain Flower Finder: A Guide to Wildflowers Found Below Tree Line in the Rocky Mountains | Janet L. Wingate |
| (1) | Rocky Mountain Gardener's Guide | John Cretti |
| Rocky Mountain Tree Finder: A Manual for Identifying Rocky Mountain Trees | Tom Watts |
| Rodale's All-New Encyclopedia of Organic Gardening: The Indispensable Resource for Every Gardener | Fern Marshall Bradley |
| Rodale's Chemical-Free Yard & Garden | Anna Carr |
| (1) | Rodale's Flower Garden Problem Solver: Annuals, Perennials, Bulbs, and Roses | Jeff Ball |
| (1) | Rodale's Garden Problem Solver | Jeff Ball |
| (2) | Rodale's Illustrated Encyclopedia of Gardening and Landscaping Techniques | Barbara W. Ellis |
| (2) | Rodale's Illustrated Encyclopedia of Herbs | Claire Kowalchik |
 (2) | Rodale's Illustrated Encyclopedia of Organic Gardening | Pauline Pears |
| (7) | Rodale's Illustrated Encyclopedia of Perennials | Ellen Phillips |
| (1) | Rodale's No-Fail Flower Garden: How to Plan, Plant, and Grow a Beautiful, Easy-Care Garden | Joan Benjamin |
| Rodale's Successful Organic Gardening Companion Planting | Susan McClure |
| (1) | Rodale's Successful Organic Gardening: Annuals and Bulbs | Rob Proctor |
| Rodale's Successful Organic Gardening: Herbs | Patricia S. Michalak |
| (2) | Rodale's Successful Organic Gardening: Landscaping with Perennials | Elizabeth P. Stell |
| Rodale's Successful Organic Gardening: Lawns, Grasses, and Ground Covers | Lewis Hill |
| Rodale's Successful Organic Gardening: Low Maintenance Landscaping | Erin Hynes |
| Rodale's Successful Organic Gardening: Vegetables | Patricia S. Michalak |
| Rodale's Weekend Gardener: Create a Low-Maintenance Landscape to Enjoy Year-Round | Erin Hynes |
| (1) | Rodales's Color Handbook of Garden Insects | Anna Carr |
| Romantic Roses | Pierre-Joseph Redoute |
| Rome and the Literature of Gardens | Victoria Emma Pagan |
| (1) | Room and Window Gardening | Walter Wright |
| Root Cellaring: Natural Cold Storage of Fruits and Vegetables | Mike Bubel |
| (1) | Roots Demystified | Robert Kourik |
| Roots of Murder (Bretta Solomon Gardening Mysteries) | Janis Harrison |
| Roots, Shoots, Buckets & Boots: Gardening Together With Children | Sharon Lovejoy |
| (1) | Rosa Gallica | Suzanne Verrier |
| Rosa Rugosa | Suzanne Verrier |
| Rose and the Clematis As Good Companions | Dr. John Howells |
| Rose Nichols: The Garden Girl | Mary R. Dunn |
| Rosemary Remembered (China Bayles Mystery) | Susan Wittig Albert |
| Rosemary Verey's Good Planting Plans | Rosemary Verey |
| (3) | Rosemary Verey's Making of a Garden | Rosemary Verey |
| Roses | Hazel White |
| (1) | Roses (Time-Life Encyclopedia of Gardening series) | James Underwood Crockett |
| (2) | Roses - A Firefly Guide | Orietta Sala |
| (1) | Roses for British Columbia | Brad Jalbert |
| (3) | Roses for Dummies | Lance Walheim |
| Roses for the Pacific Northwest | Christine Allen |
| Roses for Today | Peter Harkness |
| Roses for Washington and Oregon | Brad Jalbert |
| (1) | Roses Love Garlic: Companion Planting and Other Secrets of Flowers | Louise Riotte |
| Roses of America: The Brooklyn Botanic Gardens Guide to Our National Flower | Stephen Scanniello |
| Roses Under the Sun | Ted Stevens |
| (1) | Roses without chemicals: 150 disease-free varieties that will change the way you grow roses | Peter E. Kukielski |
| Roses: A Kew Gardening Guide (Kew Gardening Guides) | David Welch |
| (1) | Royal Gardens | Roy Strong |
| (1) | Royal Horticultural Society A-Z Encyclopedia of Garden Plants | Christopher Brickell |
| Royal Horticultural Society: The Half Hour Allotment | Lia Leendertz |
| Rueful Death (China Bayles Mystery) | Susan Wittig Albert |
| Rumphius' Orchids | Georg Eberhard Rumph |
| Ryoan-ji, a Japanese Garden | Anika Ogusu |
| (1) | Ryokan, a Japanese tradition | Gabreile Fahr-Becker |
