Pleioblastus akebono Pleioblastus argenteostriatus var. glabra 'Tsube'
Pleioblastus auricomus Pleioblastus chino var. vaginatus
Pleioblastus minima Pleioblastus pygmaeus
Pleioblastus pygmaeus var. distichus Pleioblastus simonii 'Variegatus'
Pleioblastus variegatus Poa annua
Poa colensoi Poa pratensis
Poa trivialis Podophyllum peltatum
Polaskia chende Polemonium 'Bressingham Purple'
Polemonium boreale 'Heavenly Habit' Polemonium caeruleum
Polemonium caeruleum 'Brise d'Anjou' Polemonium reptans
Polemonium yezoense 'Purple Rain' Polianthes tuberosa
Polygala paucifolia Polygonatum falcatum
Polygonatum fuscum Polygonatum humile
Polygonatum odoratum Polygonatum odoratum 'Variegatum'
Polygonatum odoratum var. thunbergii Polygonatum odoratum var. thunbergii 'Variegatum'
Polygonum affine Polygonum affine 'Border Jewel'
Polygonum affine 'Dimity' Polygonum amplexicaule
Polygonum amplexicaule 'Speciosa (Firetail)' Polygonum amplexicaule 'Taurus'
Polygonum aubertii Polygonum bistorta 'Superbum'
Polygonum campanulatum Polygonum capitatum
Polygonum emodi Polygonum fagopyrum
Polygonum japonicum Polygonum japonicum 'Compactum'
Polygonum japonicum 'Crimson Beauty' Polygonum japonicum 'Variegatum'
Polygonum microcephalum 'Red Dragon' Polygonum multiflorum
Polygonum pennsylvanicum Polygonum polymorphum
Polygonum virginianum Polygonum virginianum 'Compton's Form'
Polygonum virginianum 'Lance Corporal' Polygonum virginianum 'Painter's Pallete'
Polygonum virginianum 'Variegatum' Polypodium musifolium
Polypodium polypodiodes Polypodium vulgare 'Cornubiense'
Polystichum acrostichoides Polystichum andersonii
Polystichum nepalense Polystichum polyblepharum
Polystichum polyblepharum 'Variegated' Polystichum setiferum
Polystichum setiferum 'Densum' Polystichum setiferum 'Plumosomultilobum'
Polystichum setiferum 'Rotundatum Cristatum' Pontederia cordata
Pontederia cordata 'Giant' Pontederia cordata 'Giant White'
Pontederia cordata 'Lavender Pink' Pontederia cordata 'White'
Porphyrocoma pohliana Portulaca 'Fairytale Cinderella'
Portulaca 'Yubi' Portulaca 'Yubi Apricot'
Portulaca 'Yubi Lemon Yellow' Portulaca grandiflora
Portulaca grandiflora 'Margarita Peppermint' Portulaca grandiflora 'Margarita Rosita'
Portulaca grandiflora 'Sundial Cream' Portulaca grandiflora 'Sundial Fuchsia'
Portulaca grandiflora 'Sundial Mango' Portulaca grandiflora 'Sundial Peach'
Portulaca grandiflora 'Sundial Pink' Portulaca grandiflora 'Sundial Yellow'
Portulaca grandiflora 'Sunseeker Pink' Portulaca grandiflora 'Tropical Fruit'
Portulaca oleracea Portulaca oleracea 'Duet Yellow'
Portulaca oleracea 'Wildfire' Potentilla cuneata
Potentilla megalantha Potentilla nepalensis 'Miss Willmott'
Potentilla nepalensis 'Ron McBeath' Potentilla neumanniana
Potentilla x tonguei Pratia pedunculata