Pomelo, Shaddock (Citrus Aurantium, var. pomelana). Rutaceæ.
Usually grown from seeds, but it may be budded upon pomelo or orange stocks, as in the Orange, which see.
Pontederia (Pickerel Weed). Pontederiaceæ.
Seeds rarely. Mostly by divisions.
Poppy. See [Papaver].
Populus (Poplar, Aspen, Cotton-wood). Salicineæ.
Seeds, sown as soon as ripe and raked in light soil. Suckers are also used. Most often increased by cuttings of ripe wood, taken in fall and spring. The weeping forms are stock-grafted upon upright sorts, as P. grandidentata.
Portugal Laurel. See [Prunus].
Portulaca (Purslane, Rose Moss). Portulaceæ.
The annuals are raised from seed. Varieties are sometimes propagated by cuttings.