256 THE NURSERY-BOOK. 



Poterium, including Sanguisorba (Burnet). Rosacece. 



The herbaceous kinds are increased by seeds. The shrubs 

 are raised from soft cuttings, under glass. 



Premna, Baldingera. Verbenacece. 



Seeds and soft cuttings. 

 Prickly Ash. See Zanthoxylum. 

 Prickly Pear. See Opuntia. 

 Pride of India. See Melia. 

 Priestleya, including Achyronia. Leguminosce. 



Seeds. Cuttings of very young wood, under cover. 

 Prim. See Ligustrum. 

 Primula, Polyanthus (Primrose, Cowslip). Primulacea. 



Seeds, sown carefully in very fine soil, under glass. Some 

 rare sorts are increased by division. 



Prinos. See Ilex. 

 Pritchardia. Palmes. 



Increased by seeds. 

 Privet. See Ligustrum. 

 Prostanthera (Australian Mint). Labiatce. 



Seeds, divisions, and cuttings of growing shoots, usually 

 by the last method. 



Protea, Erodendron. Proleacece. 



Seeds. Cuttings of growing wood, under cover. 



Prune. See Plum. 



Prunus, Amygdalus. Rosacece. 



The dwarf almonds {Amygdah&) 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 or- 

 namental cherries, peaches, etc., are propagated in essentially 

 the same manner as the fruit-bearing varieties. See Almond, 

 Apricot, Cherry, Peach, Plum. P. Lauro- Cerastes 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 prop- 

 agated by cuttings of the soft wood. This method succeeds 



