Pachysandra terminalis 'Green Sheen' forms whorls of glossy, leathery foliage topped with white flowers in spring.

Pachyveria (Echeveria) 'Ice Cream' has creamy pastel green leaves with pinkish tips.

Pachyveria 'Dr Cornelius' has thick, flattened, cylindrical, silver blue, succulent leaves with pointed tips.

Packera is a daisy relative that forms a great groundcover for sun or shade with cheerful yellow flowers.

Pandanus amaryllifolus, known as pandan or screw pine, is an evergreen tropical with fragrant leaves used in culinary dishes.

Passiflora 'Clear Sky' has greater vigour and larger flowers with greater substance.

Passiflora 'Betty Myles Young' offers exquisitely detailed, large, lightly scented passionflowers.

Passiflora 'Damsel's Delight' has large, spectacular blooms with white tepals tinged with lavender-pink and dark purple and black corona filaments.

Passiflora 'Justine Lyons' has lavender-purple, reflexed tepals with thin deeper purple corona filaments and light fragrance.

Passiflora 'Party Animal' is an improved P. caerulea with white tepals and black, white and purple corona filaments.

Passiflora 'Silly Cow'/'Damsel's Delight' has dark purple filaments against pale lilac petals. Gorgeous.

Passiflora 'Snow Queen' has large, strongly fragrant, pure white flowers with long corona filaments.

Passiflora 'Star of Surbiton' has pure white petals that form the backdrop for bright purple-blue filaments.

Pelargonium crispum 'Lemona' is a tender, lemon-scented geranium with pink and magenta flowers that are both ornamental and edible.

Pelargonium 'Orange Fizz' is a tender,citrus-scented geranium with single flowers that are pink and purple and scented with evergreen foliage.

Pelargonium 'Sweet Mimosa' is a tender, spicy-scented geranium with single flowers that are pink and red with scented evergreen foliage.

Penstemon caespitosus 'Wagon Wheel' is a ground hugging perennial with stems that grow into circular mats of small blue flowers.

'Margarita BOP' is a strong, winter hardy Penstemon with tubular flowers in shades of blue and purple produced in masses all summer long.

Penstemon linarioides var. coloradoensis 'Silverton' forms evergreen, silvery mounds topped with spikes of blue, purple, and pink tubular flowers.

Penstemon pinifolius has bright scarlet red, tubular flowers that will draw every hummingbird from miles around.

Penstemon pinifolius 'Compactum' Half Pint has bright scarlet red, tubular flowers that will draw hummingbirds from miles around.

Penstemon pinifolius 'Mersea Yellow' has lemon yellow flowers that will draw every hummingbird from miles around.

Penstemon pinifolius SteppeSuns 'Sunset Glow' has warm orange flowers that will draw every hummer from miles around.

Penstemon rostriflorus is a large, long-lived beard tongue 2-3 feet tall producing tons of scarlet red tubular flowers from late July until frost.

Penstemon xylus 'Tushar Blue' is an evergreen ground hugging perennial with lavender-blue tubular flowers.