Soil

Pelargonium appendiculatum

Tuberous perennial shrub to 10 inches tall, with soft short stems and light-green feathery leaves. Winter growing, can go fully dormant in the summer. Grows in sandy soils. Creamy, pale-yellow flowers.

Pelargonium carnosum

Caudiciform, low to the ground, with small red and white flowers. Dry caudex will sprout new leaves quickly with water.

Pelargonium crithmifolium

Caudex-forming perennial shrub to 3ft, bushy green leaves. Winter growing, can go dormant in the summer. White flowers with red centers.

Pelargonium tetragonum

Semi-deciduous, can lose leaves in winter. Thin, jointed stems, small green/red leaves; hardy shrub or hanging-basket. Can grow to 6ft when supported, otherwise sprawls attractively with paired pink flowers in spring-summer.

Peniocereus greggii

1/2″ square stems, vining to 10ft. Underground caudex. Huge white night-blooming flowers. Hardy down to the mid-20s but may take damage below freezing. Needs summer heat to bloom.

Peniocereus johnstonii

1/2″ square stems, sprawling habit. Huge pale fuschia-white night-blooming flowers.

Peperomia “Hope”

Round-leafed plant, many leaves off each trailing stem. Can be grown from divisions.

Peperomia asperula

Windowed leaf edges. Small shrubs to 12″ tall, leaves have dull green bottoms and bright green tops, many vertical branches. Needs good air-circulation.

Peperomia axillaris

Windowed leaf edges. Small shrubs to 10″ tall, bright green, compact. Good air-circulation.

Peperomia columella

Small columns of densely packed window-edged green leaves. Snake-like flower shoots grow from the tops of the columnar stems.

Peperomia ferreyrae

Semi-epyphitic mounds of green rosettes. Succulent Peperomia, keep warm, provide occasional misting. Grows well as a houseplant.

Peperomia kimnachii

Sprawling succulent will trail or hang down, new branches have upright clusters of leaves. Can hang over 3ft long. Groundcover under 1ft. Hardy to 30F, protect from frost.

Peperomia prostrata

Vining succulent with small round thickened leaves, green with white veining. Upright red bloom stalks.

Peperomia tetraphylla

Round-leafed plant, many leaves off each trailing stem. Can be grown from divisions. Great as a houseplant, semi-succulent.

Pereskia grandifolia ssp. violacea

Very showy rosy flowers. Primitive cactus, non-succulent, with long spines and lots of deciduous green leaves. Grows readily in tropical climates. Shrub 3 to 4 feet.

Pereskia lychnidiflora

Tree to 30ft. elliptical leaves and long thin spines, yellow/orange flowers. Mist in summer.

Pereskiopsis diguetii

Large yellow flowers, green stems and leaves. Fast growing branchy shrubs can grow 5 to 6ft tall. Rooted stems are often used as the rootstock for grafting slower growing cactus.

Petopentia natalensis

Large caudiciform in the Milkweed Family, vining with large fruit. Keep dry in winter.

Phalaenopsis

Asian epiphytic shade orchids, over 60 species.

Piaranthus geminatus

Small thick stems, sprawling habit. Variable starfish flowers, yellow to burgundy, sometimes striped. Carrion plants, pollinated by flies. Plenty of water in hot weather to get them to readily bloom. Keep dry in winter.

Piaranthus pillansii

Probably a form of P. geminatus

Small thick stems, sprawling habit. Starfish flowers pale greenish-yellow to pale-red, without red spots. Carrion plants, pollinated by flies. Plenty of water in hot weather to get them to readily bloom. Keep dry in winter.

Pilosocereus flexibilispinus

Gorgeous blue columnar cactus, branching above ground when young. Can grow to 30 feet tall in habitat. Will form a substantial trunk.

Pilosocereus glaucescens

Tree-like to 30ft. tall; glaucous stems, golden spines.

Stunning waxy blue cactus with golden spines and wool along the ribs. Can be grown outside during the summer but should be kept inside, or under an overhang, for the winter.