| Rating | Book | Author |
| P. Allen Smith's Container Gardens : 60 Container Recipes to Accent Your Garden | P. Allen Smith |
| P. Allen Smith's Garden Home Journal | P. Allen Smith |
 (4) | P. Allen Smith's Garden Home: Creating a Garden for Everyday Living | P. Allen Smith |
| (3) | Pachyforms: A Guide to Growing Caudiciform and Pachycaul Plants | Phillipe de Vosjoli |
| Pacific Coast Fern Finder | Glenn Keator |
| (1) | Pacific Northwest gardener's book of lists | Jan McNeilan |
| (1) | Palm Trees: a Story in Photographs | David Leaser |
| Palmeiras do Brasil | Gregório Bondar |
| (1) | Palmeiras No Brasil: Nativas e Exotica | Harri Lorenzi |
| Palmeras | Jose Antonio del Canizo |
| (1) | Palms and Cycads Around the World | Jack Krempin |
| (1) | Palms and Cycads Beyond the Tropics | Keith Boyer |
| Palms and Cycads of the World | Lynette Stewart |
| Palms and Cycads: A Complete Guide to Selecting, Growing and Propagating | David Squire |
| (1) | Palms of Africa | Paul Tuley |
 (2) | Palms of Malaya | T.C. Whitmore |
| Palms of the Dominican Republic | Jurgen Hoppe |
| Palms of the World | Alec Blombery |
| (1) | Palms Throughout the World | David L. Jones |
| (4) | Palms Won't Grow Here and Other Myths: Warm-Climate Plants for Cooler Areas | David A. Francko |
| Paradise by Design: Native Plants and the New American Landscape | Kathryn Phillips |
| Paradise Found: Gardening in Unlikely Places | Rebecca Cole |
| (2) | Paradise Found: Growing Tropicals in Your Own Backyard | Norman Winter |
| Paradisus: Hawaiian Plant Watercolors by Geraldine King | David J. Mabberley |
| (1) | Paraiso Mexicano: Gardens, Landscapes, and Mexican Soul (1st edition) | Marie-Pierre Colle |
| (1) | Park's Success With Seeds | Ann Reilly |
| Parsleys, Fennels, and Queen Anne's Lace: Herbs and Ornamentals from the Umbel Family | Barbara Perry Lawton |
| (1) | Parsnips in the Snow | Jane Anne Staw |
| (8) | Passalong Plants | Steve Bender |
| (1) | Passiflora: Passionflowers of the World | Torsten Ulmer |
| (1) | Passion Flowers | John Vanderplank |
| (2) | Passion For Roses: Peter Beales' Comprehensive Guide to Landscaping with Roses | Peter Beales |
| (3) | Passionate Gardening: Good Advice for Challenging Climates | Lauren Springer Ogden |
| (5) | Pat Welsh's Southern California Gardening: A Month-By-Month Guide | Pat Welsh |
| Paths and Walkways: Simple Projects, Contemporary Designs (Garden Design Book) | Hazel White |
| Paula Pryke's Flower School: Mastering the Art of Floral Design | Paula Pryke |
| Penelope Hobhouse on Gardening | Penelope Hobhouse |
| (1) | Penelope Hobhouse's Garden Designs | Penelope Hobhouse |
| Penjing: The Chinese Art of Miniature Garden: The Shanghai Botanic Garden | Hu Yunhua |
| Pennsylvania Gardener's Guide | Liz Ball |
| (1) | Penstemons | Robert Nold |
| (3) | Peonies | Allan Rogers |
| (1) | Peonies | Jane Fearnley-Whittingstall |
| Peonies | Pamela McGeorge |
| (1) | People with Dirty Hands: The Passion for Gardening | Robin Chotzinoff |
| Peppers: The Domesticated Capsicums | Jean Andrews |
| Peppers: Vegetable and Spice Capsicums (Crop Production Science in Horticulture Series) | P.W. Bosland |
| (2) | Perennial All-Stars: The 150 Best Perennials for Great-Looking, Trouble-Free Gardens | Jeff Cox |
| (6) | Perennial Combinations: Stunning Combinations That Make Your Garden Look Fantastic Right from the Start | C. Colston Burrell |
| Perennial Garden Design | Michael King |
| (2) | Perennial Garden: Flowers for Three Seasons | Patrick Lima |
| (1) | Perennial Gardening Guide | John M. Valleau |
| Perennial Gardens: Great Ideas and Projects for Glorious Color Year After Year (Better Homes & Gardens) | Cathy Barash |
| Perennial Ground Covers | David S. Mackenzie |
| (2) | Perennial Vegetables: From Artichokes to Zuiki Taro, A Gardener's Guide to Over 100 Delicious and Easy to Grow Edibles | Eric Toensmeier |
| Perennials | Richard Rosenfeld |
| Perennials (Southern Living Garden Guide Series) | |
| (1) | Perennials (Time-Life Encyclopedia of Gardening series) | James Underwood Crockett |
| (1) | Perennials - Vol 1 Early Perennials | Roger Phillips |
| (1) | Perennials - Vol 2 Late Perennials | Roger Phillips |
| (1) | Perennials All Season: Planning and Planting an Ever-Blooming Garden | Douglas Green |
| (1) | Perennials and their garden habitats | Richard Hansen |
| (2) | Perennials for American Gardens | Ruth Rogers Clausen |
| (1) | Perennials for American Gardens: The definitive A-to-Z reference guide to over 3,000 species, cultivars and hybrids for gardeners across the country | Ruth Rogers Clausen |
| Perennials for British Columbia | Marianne Binetti |
| (8) | Perennials for Every Purpose | Larry Hodgson |
| Perennials for Illinois | Bill Aldrich |
| (2) | Perennials for Michigan | Nancy Szerlag |
| Perennials for Midwestern Gardens: Proven Plants for the Heartland | Anthony Kahtz |
| Perennials for Northern California | Bob Tanem |
| Perennials for Ohio | Debra Knapke |
| Perennials for Ontario | Alison Beck |
| Perennials for Pennsylvania | Ilene Sternberg |
| (2) | Perennials for the Southwest: Plants That Flourish in Arid Gardens | Mary F. Irish |
| Perennials for Washington and Oregon | Alison Beck |
| Perennials...What You Need To Know! Tips and Advice to Grow Tried and True Perennials. | Althea R. Griffin |
| (1) | Perennials: The Gardener's Reference | Susan Carter |
| Perennials: A Photographic Guide to More than 1,000 Plants | |
| (1) | Perennials: Enduring Classics for the Contemporary Garden | Rob Proctor |
| (1) | Perfect Plant, Perfect Garden: The 200 Most Rewarding Plants for Every Garden | Anne Scott-James |
| Perfect Plant, Perfect Place | Roy Lancaster |
| Permaculture in a Nutshell | Patrick Whitefield |
| (1) | Permaculture: A Designers' Manual | Bill Mollison |
| Permaculture: Principles and Pathways Beyond Sustainability | David Holmgren |
| (1) | Pests and Diseases (Time-Life Encyclopedia Of Gardening series) | Richard Cravens |
| Pests: Organic Balance and Conservation (Smith & Hawken) | Elizabeth Miller |
| (1) | Peterson Field Guides: Insects | Donald J. Borror |
| (1) | Phalaenopsis: A Monograph | Eric A. Christenson |
| Philadelphia Flower Show: Celebrating 175 Years | Raymond Rogers |
| Photographic Manual of Woody Landscape Plants: Form and Function in the Landscape | Michael A. Dirr |
| Photographing Flowers: Inspiration, Equipment, Technique | |
| (1) | Photographing Plants and Gardens | Clive Nichols |
| (1) | Pick the Right Plant | |
| Pickled, Potted, and Canned: How the Art and Science of Food Preserving Changed the World | Sue Shephard |
| Pickles and Relishes: 150 Recipes from Apples to Zucchinis | Andrea Chesman |
| Picture Perfect : Mowing Techniques for Lawns, Landscapes, and Sports | David R. Mellor |
| (1) | Pine Needle Basketry: From Forest Floor to Finished Product | Judy Mofield Mallow |
| Pink Ladies & Crimson Gents: Portraits and Legends of 50 Roses | Molly Glentzer |
| Pirone's Tree Maintenance (7th edition) | John R. Hartman |
| Pitcher Plants of the Americas | Stewart McPherson |
| Plan Graphics for the Landscape Designer | Tony Bertauski |
| (1) | Planning Your Garden: A Practical Guide to Designing and Planting Your Garden | Peter McHoy |
| Plant | Janet Marinelli |
| Plant Conservation: A Natural History Approach | Gary A. Krupnick |
| Plant Exploration for Longwood Gardens | Tomasz Anisko |
| Plant Form: An Illustrated Guide to Flowering Plant Morphology | Adrian Bell |
| Plant Identification Terminology: An Illustrated Glossary | James G. Harris |
| Plant Life: Growing a Garden in the Pacific Northwest | Valerie Easton |
| Plant Magic | Hugh T. W. Tan |
| Plant Parenthood for Urban Gardeners | Kate Staples |
| Plant Partners: Creative Plant Associations for Perennials | Anna Pavord |
| Plant Personalities: Choosing and Growing Plants by Character | Carol Klein |
| (1) | Plant Production in Containers | Carl E. Whitcomb |
| (2) | Plant Propagation | Philip McMillan Browse |
| (2) | Plant Propagation | Alan Toogood |
| (3) | Plant Propagation A to Z: Growing Plants for Free | Geoff Bryant |
| (1) | Plant Propagation: 999 Questions Answered | Alfred Carl Hottes |
| Plant Survival: Adapting to a Hostile World | Brian Capon |
| Plant-book: A Portable Dictionary of Plants, their Classifications, and Uses | David J. Mabberley |
| (1) | Plant-Driven Design: Creating Gardens That Honor Plants, Place, and Spirit | Scott Ogden |
| Planted Junk: A new Approach to Container Gardening | Adam Caplin |
| Plantes & Fruits tropicaux des îles de la Réunion et de Maurice | Jean-Jacques Segalen (both French & English texts) |
| (1) | Planthropology, The Myths, Mysteries, And Miracles Of My Garden Favorites | Ken Druse |
| Planting by Number: 40 Easy-to-Follow Plans to Create Stunning Color for Every Space | |
| Planting Design Illustrated | Gang Chen |
| (1) | Planting Design: Gardens in Time and Space | Piet Oudolf |
| Planting for Color | Susan Chivers |
| Planting Green Roofs and Living Walls | Nigel Dunnett |
| Planting Noah's Garden: Further Adventures in Backyard Ecology | Sara B. Stein |
| Planting Schemes from Monet's Garden | Vivian Russell |
| Planting Schemes from Sissinghurst (Garden inspirations) | Tony Lord |
| (1) | Planting the Dry Shade Garden: The Best Plants for the Toughest Spot in Your Garden | Graham Rice |
| Planting the Future: Saving Our Medicinal Herbs | Rosemary Gladstar |
| (1) | Planting the Natural Garden | Piet Oudolf |
| Planting the Seed: A Guide to Gardening | Suzanne Winckler |
| Plants and Flowers of Hawai | R. Gustafson |
| (2) | Plants and Landscapes for Summer-Dry Climates of the San Francisco Bay Region | Nora Harlow |
| Plants are Like People | Jerry Baker |
| Plants Are Still Like People | Jerry Baker |
| (1) | Plants for Dry Climates: How to Select, Grow and Enjoy | Mary Rose Duffield |
| (1) | Plants for Dry Gardens: Beating the Drought | Jane Taylor |
| Plants for Ground-Cover | Graham Stuart Thomas |
| Plants for Houston and the Gulf Coast | John Howard Garrett |
| Plants for Play: A Plant Selection Guide for Children's Outdoor Environments | Robin C. Moore |
| Plants for the Future: A Gardener's Wishbook | Jerome Malitz |
| (2) | Plants for Tropical Landscapes: A Gardener's Guide | Fred D. Rauch |
| Plants from Test Tubes: An Introduction to Micropropagation | Lydiane Kyte |
| Plants from the Edge of the World: New Explorations in the Far East | Mark Flanagan |
| Plants in Garden History | Penelope Hobhouse |
| (1) | Plants in the Getty's Central Garden | Jim Duggan |
| Plants of Arizona | Anne Epple |
| (1) | Plants of Coastal British Columbia | Jim Pojar |
| Plants of Colonial Days | Raymond L. Taylor |
| (1) | Plants of the Metroplex: Newly Revised | John Howard Garrett |
| (1) | Plants of the Pacific Northwest Coast: Washington, Oregon, British Columbia, and Alaska | Jim Pojar |
| Plants of the Rocky Mountains | Linda J. Kershaw |
| (1) | Plants of Williamsburg: How to Identify 200 of Colonial America's Flowers, Herbs, and Trees | Joan Parry Dutton |
| Plants That Merit Attention Vol. 2: Shrubs | Janet Meakin Poor |
| (1) | Plants That Merit Attention: Trees | Janet Meakin Poor |
| Plantsman in Nepal | Roy Lancaster |
| (1) | Pleasure Gardens | Phillip Watson |
| (1) | Plot: designing your garden | Meredith Kirton |
| (1) | Pluk je eigen Geluk (Pick Your Own Luck) | Astrid Jonker |
| (1) | Pocket Guide to Annuals | |
| Poison Ivy, Pets, & People: Scratching the Poison Ivy, Oak, and Sumac Itch | Heidi Connolly |
| Poisonous Plants: A Handbook for Doctors, Pharmacists, Toxicologists, Biologists and Veterinarians | Dietrich Frohne |
| (1) | Pomegranate Roads | Dr. Gregory M. Levin |
| Poolscaping: Gardening and Landscaping around Your Swimming Pool and Spa | Catriona Tudor Erler |
| (1) | Poppies: A Guide to the Poppy Family in the Wild and in Cultivation | Christopher Grey-Wilson |
| (1) | Popular Encyclopedia of Plants | Vernon H. Heywood |
| Popular Errors About Plants | A. A. Crozier |
| Portable Gardens: self-watering - no weeding | Brenda Cameron |
| Portraits of Himalayan Flowers | Toshio Yoshida |
| Posta Frutta | Helen Buttfield |
| Pots in the Garden: Expert Design & Planting Techniques | Ray Rogers |
| (1) | Potted Gardens: A Fresh Approach To Container Gardening | Rebecca Cole |
| Potting Places | Teri Dunn |
| Practical Bamboos | Paul Whittaker |
| (1) | Practical Gardener: Architectural Plants: What to Grow and How to Grow It | Christine Shaw |
| Practical Guide to Home Landscaping: 1001 Ways for Canadians to Improve Their Lawn and Garden | Doug Baylis |
| Practical Handbook: The Complete Guide to Container Gardening | Stephanie Donaldson |
| Practical Plant Identification | James Cullen |
| Practical Science for Gardeners | Mary Pratt |
| (1) | Practical Small Gardens | Peter McHoy |
| Practical Woody Plant Propagation for Nursery Growers | Bruce MacDonald |
| (1) | Premium Plants, Superior perennials for the Great Lakes States 3rd edition | David S. Mackenzie |
| (1) | Preserving Food Without Freezing or Canning | The Gardeners and Farmers of Terre Vivante |
| (1) | Preserving Summer's Bounty: A Quick and Easy Guide to Freezing, Canning, and Preserving, and Drying What You Grow | Susan McClure (editor) |
| Pressed Flowers | Pamela Le Bailly |
| (1) | Primroses | Roy Genders |
| (1) | Primula | John Richards |
| Principles and Practice of Plant Conservation | David R. Given |
| Principles of Biodynamic Spray and Compost Preparations | Manfred Klett |
| Principles of Botany | Gordon Uno |
| (1) | Private Lives of Garden Birds | Calvin Simonds |
| Production of Florist Azaleas (Growers Handbook Series) | Roy A. Larson |
| Production of Pot Roses (Growers Handbook Series) | H. Brent Pemberton |
| Production of Vegetables, Strawberries, and Cut Flowers Using Plasticulture | William J. Lamont, Jr. |
| Professional Planting Design | Scott Scarfone |
| Projects for Small Gardens | Richard Bird |
| (1) | Projects for the Birder's Garden: Over 100 Easy Things That You Can Make to Turn Your Yard and Garden into a Bird-Friendly Haven | Fern Marshall Bradley |
| (1) | Propagation Handbook: Basic Techniques for Gardeners | Geoff Bryant |
| Protea Book: A Guide to Cultivated Proteaceae | Lewis Matthews |
| Proteas in Hawaii | Paul Wood |
| Proteas of the World | Lewis Matthews |
| (1) | Pruning | Christopher Brickell |
| (1) | Pruning and Grafting (Time-Life Encyclopedia of Gardening series) | James Underwood Crockett |
| (1) | Pruning and Training Plants - A Complete Guide | David Joyce |
| (1) | Pruning for Flowers and Fruit | Jane Varkulevicius |
| (2) | Pruning Made Easy: A Gardener's Visual Guide to When and How to Prune Everything, from Flowers to Trees | Lewis Hill |
| Pruning Trees, Shrubs & Vines | Karan Davis Cutler |
| (1) | Pull Up Your Agapanthus, Your Aster is Showing | Elizabeth S. Creamer |
| Pulmonarias | Jennifer Hewitt |
| Pulmonarias and the Borage Family | Masha Bennett |
| Pumpkin Production Guide | Dale Ila Miles Riggs |
| Pumpkins | Cynthia Klingel |
| (3) | Putting Food By | Janet C. Greene |
