=Phormium= (Flax Lily, or New Zealand Flax). _Liliaceæ._ Seeds. Also by division of the crowns before growth commences in spring. =Photinia=, including Eriobotrya. _Rosaceæ._ Stratified seeds or half-ripened cuttings under glass. The loquat, _P. Japonica_, is grown from layers or cuttings of ripe wood, and it is worked upon seedling stocks or upon thorn or quince, after the manner of pears. =Phylica.= _Rhamneæ._ Seeds. Cuttings of growing shoots may be inserted in sandy soil, in a warm house. =Phyllanthus=, including Xylophylla. _Euphorbiæceæ._ Increased by means of cuttings of hard shoots in heat. =Phyllis.= _Rubiaceæ._ Seeds, or cuttings under glass. =Phyllocactus=, including Phyllocereus and Disocactus (Leaf Cactus). _Cacteæ._ Seeds germinate readily in sandy soil. Usually increased by cuttings of the stems, five or six inches long, placed in sandy soil, which is kept only slightly moist. See also Cactus. =Phyllocladus=, Thalamia (Celery-leaved Pine-Tree). _Coniferæ._ Cuttings of the ripened shoots under glass, in spring. When the cuttings begin callusing, give mild bottom heat. =Physalis= (Ground or Winter Cherry, Strawberry Tomato, Husk Tomato). _Solanaceæ._ Seeds, sown out-doors or under cover. Perennials by division and growing cuttings. =Physianthus=, Schubertia. _Asclepiadeæ._ Seeds, usually started in heat. Cuttings of firm shoots usually side shoots, under glass. =Physochlaina.= _Solanaceæ._ Seeds. Cuttings of soft wood. =Phyteuma=, Rapunculus (Horned Rampion). _Campanulaceæ._ Easily increased by seeds or by divisions, in spring. =Phytolacca= (Spoke, Skoke, Poke). _Phytolaccaceæ._ May be propagated by means of seeds, or by divisions. =Picea.= _Coniferæ._ Propagated by seeds, sometimes by layers, or grafts. _P. excelsa_ (Norway spruce) makes a good stock; the veneer graft, under glass, in winter, succeeds better than any method of out-door work practicable in our climate; if the graft is inserted near the base in young plants, it is quite possible to obtain them on their own roots after a few transplantings. Side-shoots can be used as cions, and if started in time will furnish good leaders; sometimes a leader is developed more rapidly by bending the plant over at nearly a right-angle, when a stout bud may start from the stem. See Abies. =Pickerel Weed.= See Pontederia. =Picotee.= See Dianthus and Carnation. =Pilea= (Artillery Plant, Stingless Nettle). _Urticaceæ._ May be increased by seeds, divisions or cuttings. =Pilocereus.= See Cactus. =Pimelea=, Banksia. _Thymelæaceæ._ Seeds. Cuttings of growing shoots in moderate heat. =Pimpernel.= See Anagallis. =Pinanga.= _Palmæ._ Propagated by seeds. =Pinckneya=, Pinknea. _Rubiaceæ._ Seeds. Cuttings of the ripened shoots under glass.