| | | | |
| P | Genus | Species | Cultivar | Common Name |
 | PACHYSANDRA | terminalis | | |
| PAEONIA | delavayi | | AGM Red Tree Peony |
| PAEONIA | mlokosewitschii | | AGM Molly the Witch |
| PANICUM | virgatum | 'Dallas Blues' | |
| PANICUM | virgatum | 'Warrior' | |
| PAPAVER | orientale | 'Konigen Alexandra' | |
| PAPAVER | orientale | 'Patty's Plum' | |
| PAPAVER | orientale | 'Perry's White' | syn P. 'Mrs. Perry's White' |
| PAPAVER | orientale | 'Snow Goose' | |
| PARADISEA | lusitanica | | |
| PARAHEBE | perfoliata | | AGM |
| PELARGONIUM | | 'Amelit' | Ivy Leaf |
| PELARGONIUM | | 'Ardens' | |
| PELARGONIUM | | 'Atlantic Burgundy' | |
| PELARGONIUM | | 'Atomic Snowflake' | From JMR |
| PELARGONIUM | | 'Attar of Roses' | AGM Scented Leaf |
| PELARGONIUM | | 'Black Velvet' | Regal |
| PELARGONIUM | | 'Caroline Schmidt' | Variegated Leaf |
| PELARGONIUM | | 'Cathy' | |
| PELARGONIUM | | 'Cezanne' | Regal |
| PELARGONIUM | | 'Charity' | AGM |
| PELARGONIUM | | 'Citriodorum' | AGM Scented Leaf |
| PELARGONIUM | | 'Clorinda' | Scented Leaf |
| PELARGONIUM | | 'Concolor Lace' | |
| PELARGONIUM | | 'Copthorne' | AGM from JMR |
| PELARGONIUM | | 'Crimson Unique' | AGM |
| PELARGONIUM | | 'Frank Headley' | AGM Variegated Leaf |
| PELARGONIUM | | 'Friesdorf' | |
| PELARGONIUM | | 'Happy Thought' | AGM Variegated Leaf |
| PELARGONIUM | | 'Hederinum Variegatum' | Ivy Leaf syn. P.'Mme Margot' |
| PELARGONIUM | | 'L'Elegante' | Ivy Leaf |
| PELARGONIUM | | 'Lilac Gem' | Ivy Leaf |
| PELARGONIUM | | 'Lord Bute' | AGM Regal |
| PELARGONIUM | | 'Mabel Grey' | Scented Leaf |
| PELARGONIUM | | 'Millfield Rose' | |
| PELARGONIUM | | 'Mrs. Farren' | |
| PELARGONIUM | | 'Paton's Unique' | AGM |
| PELARGONIUM | | 'Paul Crampel' | |
| PELARGONIUM | | 'Phyllis' | |
| PELARGONIUM | | 'Pink Caroline Schmidt' | Variegated Leaf |
| PELARGONIUM | | 'Pink Champagne' | Scented Leaf |
| PELARGONIUM | | 'Pretty Girl' | Variegated Leaf |
| PELARGONIUM | | 'Purple Unique' | Scented Leaf |
| PELARGONIUM | | 'Red Blizzard' | |
| PELARGONIUM | | 'Renate Parsley' | |
| PELARGONIUM | | 'Rose Silver Cascade' | Ivy Leaf |
| PELARGONIUM | | 'Royal Black Rose' | |
| PELARGONIUM | | 'Royal Oak' | AGM Scented Leaf |
| PELARGONIUM | | 'Scarlet Unique' | Scented Leaf |
| PELARGONIUM | | 'Springfield Black' | Regal |
| PELARGONIUM | | 'Sweet Mimosa' | AGM |
| PELARGONIUM | | 'The Boar' | AGM Single |
| PELARGONIUM | | 'Tommy' | Ivy Leaf |
| PELARGONIUM | | 'Vancouver Centennial' | |
| PELARGONIUM | | 'Voodoo' | Regal |
| PELARGONIUM | | 'Wooten's Unique' | |
| PELARGONIUM | australe | | |
| PELARGONIUM | fulgidum | | |
| PELARGONIUM | grandiflorum | | |
| PELARGONIUM | ionidiflorum | | |
| PELARGONIUM | papilionaceum | | |
| PELARGONIUM | sidoides | | from Helen Dillon via Caroline |
| PELARGONIUM | tomentosum | | AGM Scented Leaf |
| PENSTEMON | | 'Alice Hindley' | AGM |
| PENSTEMON | | 'Apple Blossom' | AGM |
| PENSTEMON | | 'Blackbird' | |
| PENSTEMON | | 'Countess of Dalkeith' | |
| PENSTEMON | | 'Evelyn' | AGM |
| PENSTEMON | | 'Garnet' | AGM Syn. 'Andenken an Friedrich Hahn' |
| PENSTEMON | | 'Hidcote Pink' | AGM |
| PENSTEMON | | 'King George V' | |
| PENSTEMON | | 'Mother of Pearl' | |
| PENSTEMON | | 'Pensham Czar' | |
| PENSTEMON | | 'Pensham Plum Jerkum' | AGM |
| PENSTEMON | | 'Port Wine' | AGM |
| PENSTEMON | | 'Raven' | AGM |
| PENSTEMON | | 'Stapleford Gem' | AGM |
| PENSTEMON | | 'White Bedder' | AGM syn. P.'Snowstorm' |
| PENSTEMON | digitalis | 'Husker Red' | |
| PENSTEMON | heterophyllus | 'Heavenly Blue' | |
| PERSICARIA | affinis | 'Darjeeling Red' | |
| PERSICARIA | affinis | 'Superba' | AGM |
| PERSICARIA | amplexicaulis | 'Alba' | |
| PERSICARIA | amplexicaulis | 'Firetail' | AGM |
| PERSICARIA | amplexicaulis | 'Rosea' | |
| PERSICARIA | bistorta | 'Superba' | AGM |
| PERSICARIA | campanulata | | |
| PERSICARIA | campanulata | Alba Group | |
| PERSICARIA | microcephala | 'Red Dragon' | |
| PEUCEDANUM | verticillare | | |
| PHLOMIS | fruticosa | | AGM Jerusalem Sage |
| PHLOMIS | russeliana | | AGM |
| PHLOX | carolina | 'Miss Lingard' | AGM |
| PHLOX | divaricata subsp laphamii | 'Chatahoochee' | AGM |
| PHLOX | maculata | 'Natascha' | |
| PHLOX | maculata | 'Omega' | AGM |
| PHLOX | paniculata | 'Blue Evening' | |
| PHLOX | paniculata | 'Blue Paradise' | |
| PHLOX | paniculata | 'Brigadier' | AGM |
| PHLOX | paniculata | 'Bright Eyes' | AGM |
| PHLOX | paniculata | 'Discovery' | |
| PHLOX | paniculata | 'Europa' | |
| PHLOX | paniculata | 'Eva Cullum' | |
| PHLOX | paniculata | 'Eventide' | AGM |
| PHLOX | paniculata | 'Eventide' | AGM |
| PHLOX | paniculata | 'Franz Schubert' | |
| PHLOX | paniculata | 'Jade' | |
| PHLOX | paniculata | 'Monica Lynden-Bell' | |
| PHLOX | paniculata | 'Mount Fuji' | AGM |
| PHLOX | paniculata | 'Prince of Orange' | |
| PHLOX | paniculata | 'Red Indian' | |
| PHLOX | paniculata | 'Starfire' | AGM |
| PHLOX | paniculata | 'Tenor' | |
| PHLOX | paniculata | 'Uspekh' | |
| PHLOX | stolonifera | 'Ariane' | |
| PHYSOSTEGIA | virginiana | 'Miss Manners' | |
| PHYSOSTEGIA | virginiana | 'Vivid' | AGM Obedient Plant |
| PHYSOSTEGIA | virginiana var.speciosa | 'Bouquet Rose' | |
| PHYTOLACCA | americana | | Red Ink Plant |
| PLECTRANTHUS | argentatus | | AGM |
| PLECTRANTHUS | thyrsoideus | | |
| POLEMONIUM | | 'Northern Lights' | |
| POLEMONIUM | yezoense | 'Purple Rain' | |
| POLYGONATUM | biflorum | | syn. P.commutatum. Solomon's Seal |
| POLYGONATUM | odoratum | var.pluriflorum 'Variegatum' | AGM syn. P.falcatum 'Variegatum' |
| POLYGONATUM | x hybridium | | AGM |
| POLYSTICHUM | setiferum | Div. Grp Coton Twister Lrg | |
| POLYSTICHUM | setiferum | Div. Grp Coton Twister Sml | |
| POLYSTICHUM | setiferum | Divisilobum Group | |
| POLYSTICHUM | setiferum | 'Plumosumdensum' | |
| POTENTILLA | | 'Esta Ann' | |
| POTENTILLA | | 'Gibson's Scarlet' | AGM |
| POTENTILLA | | 'William Rollison' | AGM |
| POTENTILLA | nepalensis | 'Ron McBeath' | |
| POTENTILLA | recta var. sulphurea | | |
| POTENTILLA | thurberi | | |
| POTENTILLA | thurberi | 'Monarch's Velvet' | |
| PRATIA | pedunculata | | |
| PRIMULA | | Gold-laced Group | |
| PRIMULA | | 'Iris Mainwaring' | |
| PRIMULA | | 'John Fielding' | |
| PRIMULA | | 'Lady Greer' | AGM |
| PRIMULA | | Susie's Yellow | |
| PRIMULA | | 'Wanda Tomato Red' | |
| PRIMULA | | 'White Petticoat' | Double White |
| PRIMULA | bulleyana | | AGM |
| PRIMULA | florindae | | AGM Giant Cowslip |
| PRIMULA | japonica | 'Miller's Crimson' | AGM |
| PRIMULA | secundiflora | | |
| PRIMULA | vulgaris | | AGM Primrose |
| PRIMULA | vulgaris | subsp sibthorpii | AGM |
| PRIMULA | waltonii | | |
| PRIMULA | waltonii hybrids | | |
| PRIMULA | waltonii hybrids | pale creamy rosy red | 7 |
| PRIMULA | waltonii hybrids | pale red | 9 |
| PRIMULA | waltonii hybrids | short dark purple | 4 |
| PRIMULA | waltonii hybrids | short orange | 5 |
| PRIMULA | waltonii hybrids | tall dark purple | 2 |
| PRIMULA | waltonii hybrids | tall orange | 1 |
| PRIMULA | waltonii hybrids | tall purple | 8 |
| PRIMULA | wilsonii | | |
| PRUNUS | laurocerasus | 'Otto Luyken' | Cherry Laurel |
| PRUNUS | lusitanica | | Portugal Laurel |
| PULMONARIA | | 'Blue Ensign' | |
| PULMONARIA | | 'Cotton Cool' | |
| PULMONARIA | | 'Sissinghurst White' | AGM |
| PULMONARIA | angustifolia | 'Azurea' | |
| PULMONARIA | angustifolia | 'Munstead Blue' | |
| PULMONARIA | officinalis | 'Opal' | |
| PULMONARIA | saccharata | 'Dora Bielefeld' | |
| PULSATILLA | vulgaris | | AGM Pasque Flower |
| PULSATILLA | vulgaris | 'Alba' | AGM |
| PULSATILLA | vulgaris | 'Rode Klokke' | |
| PULSATILLA | vulgaris | var. rubra | |