Nannorrhops ritchieana - Afghan Palm, Mazari Palm - Shrub

Nolina lindheimeriana - Bear Grass - Shrub

Nolina nelsonii - Nelson's Nolina - Shrub

Nolina texana - Bear Grass - Shrub

Odontonema strictum - Firespike - Perennial

Ophiopogon japonicus - Monkey Grass - Groundcover

Ophiopogon japonicus (Dwarf) - Dwarf Monkey Grass - Groundcover

Orbexilum pedunculatum - Mountain Pea, Sampson's Snakeroot - Perennial

Oryza sativa - Rice - Edible Annual

Oxalis crassipes - Pink Oxalis - Perennial

Panicum virgatum - Switchgrass - Ornamental Grass

Panicum virgatum 'Heavy Metal' - Upright Switchgrass - Ornamental Grass

Parthenocissus henryana - Chinese Creeper - Vine

Parthenocissus heptaphylla - Hill Country Creeper - Vine

Parthenocissus quinquefolia - Virginia Creeper - Vine

Parthenocissus quinquefolia 'Englemannii' - Small-Leaf Virginia Creeper - Vine

Parthenocissus quinquefolia var. hirsuta - Velvet Creeper - Vine

Passiflora caerulea - "Evergreen" Passionvine - Vine

Passiflora foetida - Passionvine - Vine

Passiflora incarnata - Passionvine - Vine

Passiflora X 'Incense' - 'Incense' Passionvine - Vine

Passiflora lutea - Passionvine - Vine

Pavonia lasiopetala - Pavonia, Rock Mallow, Rock Rose - Perennial

Pavonia spiniflex - Yellow Pavonia - Perennial

Penstemon cobaea - Prairie Foxglove - Perennial

Penstemon triflorus - Hill Country Penstemon - Perennial

Perovskia atriplicifolia - Russian Sage - Perennial

Perovskia atriplicifolia 'Filigran' - 'Filigran' Russian Sage - Perennial

Persea americana var. drymifolia '5 de Mayo' - '5 de Mayo' Mexican Avocado - Tender Tree

Persea americana var. drymifolia 'Rio Bravo' - 'Rio Bravo' Mexican Avocado - Tender Tree

Persea americana var. drymifolia 'Veracruz' - 'Veracruz' Mexican Avocado - Tender Tree

Persea americana var. drymifolia 'Verde' - 'Verde' Mexican Avocado - Tender Tree

Petroselinum crispum - Italian Parsley - Biennial Edible Herb

Phalaris arundinacea 'Feesey' - Variegated Canary Grass - Ornamental Grass

Philodendron selloum - Split-Leaf Philodendron - Perennial 

Phoenix canariensis - Canary Island Date Palm - Tree

Phoenix theophrasti - Cretan Date Palm - Tree

Phragmites australis (communis) - Common Reed - Ornamental Grass

Phyllostachys acuta - Hardy Bamboo

Phyllostachys angusta - Stone Bamboo - Hardy Bamboo

Phyllostachys arcana - Hardy Bamboo

Phyllostachys aurea - Golden Bamboo - Hardy Bamboo

Phyllostachys aurea 'Albovariegata' - Variegated Golden Bamboo - Hardy Bamboo

Phyllostachys aurea 'Flavescens' - Hardy Bamboo

Phyllostachys aurea 'Flavescens-Inversa' - Hardy Bamboo

Phyllostachys aurea 'Holochrysa' - Golden Golden Bamboo - Hardy Bamboo

Phyllostachys aurea 'Koi' - Hardy Bamboo

Phyllostachys aurea 'Takemurai' - Hardy Bamboo

Phyllostachys aureosulcata - Yellow Groove Bamboo - Hardy Bamboo

Phyllostachys aureosulcata 'Aureocaulis' - Hardy Bamboo

Phyllostachys aureosulcata 'Harbin' - Hardy Bamboo

Phyllostachys aureosulcata 'Spectabilis' - Hardy Bamboo

Phyllostachys bambusoides - Hardy Timber Bamboo - Hardy Bamboo

Phyllostachys bambusoides 'Allgold' - Hardy Bamboo

Phyllostachys bambusoides 'Castillon' - Hardy Bamboo

Phyllostachys bambusoides 'Castillon Inversa' - Hardy Bamboo

Phyllostachys bambusoides 'Kawadana' - Hardy Bamboo

Phyllostachys bambusoides 'Marliac' - Hardy Bamboo

Phyllostachys bambusoides forma geniculata - 'Slender Crookstem' Bamboo - Hardy Bamboo

Phyllostachys bambusoides 'Tanakae' - Hardy Bamboo

Phyllostachys bambusoides 'White Crookstem' - Hardy Bamboo

Phyllostachys bissetii - Hardy Bamboo

Phyllostachys dulcis - Sweetshoot Bamboo - Hardy Bamboo

Phyllostachys edulis - Moso Bamboo - Hardy Bamboo

Phyllostachys edulis 'Heterocycla' - Tortoise Shell Bamboo - Hardy Bamboo

Phyllostachys elegans - Hardy Bamboo

Phyllostachys glauca - Hardy Bamboo

Phyllostachys flexuosa - Hardy Bamboo

Phyllostachys heteroclada 'Solidstem' - Hardy Bamboo

Phyllostachys iridescens - Hardy Bamboo

Phyllostachys makinoi - Makino's Bamboo - Hardy Bamboo

Phyllostachys mannii 'Decora' - Hardy Bamboo

Phyllostachys meyeri - Meyer's Bamboo - Hardy Bamboo

Phyllostachys nidularia - Hardy Bamboo

Phyllostachys nigra - Black Bamboo - Hardy Bamboo

Phyllostachys nigra 'Bory' - Bory Bamboo - Hardy Bamboo

Phyllostachys nigra 'Daikokuchiku' - Daikokuchiku Bamboo - Hardy Bamboo

Phyllostachys nigra 'Hale' - Hale Black Bamboo - Hardy Bamboo

Phyllostachys nigra 'Henon' - Henon Bamboo - Hardy Bamboo

Phyllostachys nigra 'Megurochiku' - Megurochiku Bamboo - Hardy Bamboo

Phyllostachys nigra 'Othello' - Othello Black Bamboo - Hardy Bamboo

Phyllostachys nuda - Hardy Bamboo

Phyllostachys rubromarginata - Edible Bamboo - Hardy Bamboo

Phyllostachys violascens - Hardy Bamboo

Phyllostachys viridis - Hardy Timber Bamboo - Hardy Bamboo

Phyllostachys viridis 'Houzeau' - Hardy Bamboo

Phyllostachys viridis 'Robert Young' - Variegated Hardy Timber Bamboo - Hardy Bamboo

Phyllostachys vivax - Hardy Bamboo

Phyllostachys vivax 'Aureocaulis' - Hardy Bamboo

Physostegia angustifolia - Obedient Plant - Perennial

Physostegia correllii - Giant Obedient Plant - Perennial

Pinus arizonica var. stormiae - Pine - Tree 

Pinus ayacahuite var. brachyptera - Mexican White Pine - Tree 

Pinus catarinae - Considered by some to be a form of Pinus remota - Santa Catarina Piñon - Shrub

Pinus greggii - Gregg’s Pine - Tree

Pinus greggii var australis - Southern Gregg’s Pine - Tree

Pinus montezumae - Montezuma Pine - Tree

Pinus nelsonii - Piñon - Tree

Pinus patula - Pine -Tree

Pinus pinea - Italian Stone Pine - Tree

Pinus pseudostrobus forma megacarpa - Pine - Tree

Pinus pseudostrobus var. estevezii - Also known as Pinus estevezii - Pine - Tree

Pinus remota - Hill Country Pinyon, Piñon - Tree

Pinus rudis - Pine - Tree

Pinus teocote - Pine - Tree

Piper auritinum - Hoja Santa, Rootbeer Plant - Perennial

Piper nigrum - Black Pepper - Perennial

Pithecellobium flexicaule - Texas Ebony - Not reliably cold-hardy

Platanus lindeniana - Tree

Pleioblastus chino 'Vaginatus Variegatus'  - Hardy Bamboo

Pleioblastus distichus - Hardy Bamboo

Pleioblastus fortunei - Hardy Bamboo

Pleioblastus pygmaeus - Hardy Bamboo

Pleioblastus simonii - Medake - Hardy Bamboo

Poa annua - Annual Bluegrass - Winter Annual

Poliomintha longiflora - Mexican Oregano - Edible Perennial

Poncirus trifoliata - Trifoliate Orange - Large Shrub

Poncirus trifoliata 'Flying Dragon' - 'Flying Dragon' Trifoliate Orange - Large Shrub

Prosopis alba - Argentinian Mesquite - Tree

Prunus serotina var. eximia - Escarpment Black Cherry - Tree

Pseuderanthemum alatum - Chocolate Plant - Perennial

Pseudogynoxis chenopodioides - Flame Vine - Tender Perennial

Pseudosasa amabilis - Tonkin Cane - Hardy Bamboo

Pseudosasa japonica - Arrow Bamboo - Hardy Bamboo

Pseudosasa japonica var. tsutsumiana - Onion Bamboo - Hardy Bamboo

Psophocarpus tetragonolobus - Winged Bean - Edible Annual

Ptelea trifoliata - Hop Tree, Wafer Ash - Shrub

Quercus  buckleyi - Hill Country Red Oak, Texas Red Oak - Tree

Quercus canbyi - Canby's Oak, Sierra Red Oak - Tree

Quercus  germana - Avocado-Leaf Oak - Tree

Quercus  gracilliformis - Chisos Red Oak - Tree

Quercus  hinckleyi - Hinckley's Oak - Shrub

Quercus  laceyi - Lacey's Oak - Tree (Resistant to Oak Wilt)

Quercus  macrocarpa - Bur Oak - Tree (Resistant to Oak Wilt)

Quercus  muehlenbergii - Chinkapin Oak - Tree (Resistant to Oak Wilt)

Quercus  polymorpha - Mexican Live Oak - Tree

Quercus pungens var. vaseyana - Vasey's Oak - Shrub (rarely a Tree)

Quercus  rysophylla - Loquat-Leaf Oak - Tree

Quercus  sinuata var. breviloba - Shin Oak - Tree (Resistant to Oak Wilt)

Quercus sinuata var. sinuata - Durand White Oak - Tree (Resistant to Oak Wilt)

Quisqualis indica - Rangoon Creeper - Perennial Vine