Phlomis (Lion’s Tail).—­This effective hardy perennial will grow in any rich, light soil in a warm position, and is a fine lawn plant.  Flowers are produced from June to August.  It may be increased by seed or division.  Protect the plant from damp in winter.  Height, 3 ft.

Phlox.—­For richness of colour and duration of bloom there are few plants that can rival either the annual or perennial Phlox.  The trailing kinds are very suitable for small pots or rock-work, C. Drummondi for beds, and the French perennials, P. Decussata, for mixed borders.  A rich, loamy soil suits them best, and they must never lack moisture.  They are easily raised in spring from seed, and the perennials may be increased by cuttings placed under glass, or by division.  Flower in July.  Height, 1 ft. to 2 ft.

Phormium Tenax.—­A greenhouse herbaceous plant which succeeds best in rich loam.  It flowers in August, and may be propagated by dividing the roots.  Height, 3 ft.

Phygelius Capensis.—­A greenhouse perennial bearing carmine and yellow flowers in June, but is hardy enough to be grown on a warm border.  It is increased by off-sets from the root, taken off in May.  Height, 2 ft.

Physalis (Winter Cherry).—­A rich, light soil is most suitable for the stove and greenhouse kinds, cuttings of which root freely under glass.  The hardy kinds will grow in any soil, and are increased by seed.  P. Francheti produces seed-pods over 2 in. in diameter, the Cherry-like fruit of which is edible and makes a fine preserve.  It is larger than that of the old Winter Cherry, P. Alkekengi.  They flower in August.  Height, 1 ft. to 2 ft.

Physianthus Albens.—­This evergreen climber is a good plant for training to the rafters of a greenhouse.  It grows well in a mixture of sandy loam and peat, and should receive bold treatment.  Its white flowers are produced in July.  The plant is propagated by seeds, also by cuttings.  Height, 20 ft.

Physostegia.—­Ornamental hardy herbaceous plants, ranging in colour from white to purple.  They like a rich soil, and can be raised from seed sown in March.  They also bear division.  July and August are their flowering months.  Height, from 1 ft. to 5 ft.

Phyteuma Hallierii.—­A very pretty hardy perennial.  It will thrive in any soil, blooms from May to August, and can be readily increased by seed or division.  Height, 1-1/2 ft.

Phytolacca Decandra (Virginian Poke).—­A very fine herbaceous plant, bearing bunches of pretty black berries.  It requires a rich soil and plenty of room for its widespreading branches.  Cuttings will strike under glass, or the seed may be sown in autumn.  It flowers in August.  Height, 6 ft.

Picotees.—­See “Carnations.”

Pimelias.—­Very beautiful, compact, and free-growing greenhouse everlasting shrubs.  The most suitable soil consists of three parts sandy peat and one part loam, with good drainage.  June or July is their flowering season.  They may be grown from seed or young cuttings 2 in. long, placed in sandy peat, with a little bottom heat.  Do not give too much water.  Height, 2 ft. to 4 ft.