Oats
Old man's beard
One-flower clover
One-leaf cape tulip
Onion grass
Onion orchid
Onion weed
Opium poppy
Ovens wattle
Ox-eye daisy
Oyster Bay pine
Oyster Plant
Pampas
Pampas lily of the valley
Pandani
Panic grass
Pansey
Parrot feather
Parrot pea
Parsley
Parsley piert Parsnip Parson's bands Passionfruit Patterson's curse Pearlwort Pellitory Pencil pine Pennyroyal Penny spurge Pennywort Pepperberry Peppercress Peppermint Perennial beardgrass Perennial ryegrass Perennial thistle Periwinkle
Parsnip
Parson's bands
Passionfruit Patterson's curse Pearlwort Pellitory Pencil pine Pennyroyal Penny spurge Pennywort Pepperberry Peppercress Peppermint Perennial beardgrass Perennial ryegrass Perennial thistle Periwinkle
Patterson's curse
Pearlwort
Pellitory
Pencil pine
Pennyroyal
Penny spurge
Pennywort
Pepperberry
Peppercress
Peppermint
Perennial beardgrass
Perennial ryegrass
Perennial thistle
Periwinkle
Petty spurge
Pheasant's eye
Pigface
Pigroot
Pigweed
Pimpernel
Pincushion
Pineapple grass
Pink autumn orchid
Pink fairies
Pink fingers
Pink valerian
Plantain
Plum
Polyanthus
Pondweed
Poppy
Poplar
Port Arthur plum
Potato orchid
Potato weed
Prairie grass
Prickly beauty
Prickly box
Prickly mimosa
Prickly mo
Prickly lettuce
Pride of Madeira
Privet
Proliferous pink
Propeller plant
Purple flag iris
Purple loosestrife
Pussy willow
Pussy tails
Pyrethrum