Privet. See [Ligustrum].
Prostanthera (Australian Mint). Labiatæ.
Seeds, divisions, and cuttings of growing shoots, usually by the last method.
Protea, Erodendron. Proteaceæ.
Seeds. Cuttings of growing wood, under cover.
Prune. See [Plum].
The dwarf almonds (Amygdalus) are increased by seeds, divisions, cuttings, and by budding upon seedling plum or peach stocks; also by root-cuttings. Peach stocks give larger trees at first than plum stocks, but the trees are not so long-lived. Perhaps ten years may be considered the average life of most ornamental almonds upon the peach, while upon the plum they may persist twenty-five years or more. The ornamental cherries, peaches, etc., are propagated in essentially the same manner as the fruit-bearing varieties. See [Almond], Apricot, Cherry, Peach, Plum. P. Lauro-Cerasus and P. Lusitanica, the cherry laurel and Portugal laurel, may be propagated by short cuttings of ripened wood, in a cool greenhouse in autumn. P. Pissardii is said to be easily propagated by cuttings of the soft wood. This method succeeds well with many of the double-flowering plums and cherries, if the wood is grown under glass.
Pseudotsuga. Coniferæ.
Propagated the same as Abies, which see.