THE NURSERY-LIST 403 



should produce full-sized tubers. Potatoes are grown from seed only 

 for the production of new varieties. Potatoes may be grown from 

 stem-cuttings, taken as for geraniums. The cutting will produce 

 one or more small tubers underground, and these may be grown 

 the same as the small tubers raised from seeds, but new varieties 

 are not produced this way. Figs. 101, 102. 



If the seed is sown by April 1 following maturity, in a hotbed 

 or greenhouse, and pricked out or potted off when the first true leaf 

 is developed, and transplanted to the open field in the latter part of 

 May or early June, many of the seedlings will produce full-sized 

 tubers the first season, thereby saving at least one year's time as it 

 is then possible to determine whether they are promising or not. 

 William Stuart. 



Potentilla (Cinquefoil. Five-Finger). Rosaceoe. 



Propagated by seeds, layers, division, rarely by green cuttings. 



Pothos. Aracece. 



Propagation as for philodendron, by dividing the rooting stems. 



Primula, Polyanthus (Primrose. Cowslip). Primulaceas. 



Grown from seeds, sown carefully in very fine soil, under glass. 

 They may be sown in February in pans or flats in a mixture of loam, 

 leaf -mold and sand, placed in a warm greenhouse. Seeds may also 

 be sown in a coldframe in April or May. The seeds should be fresh ; 

 old ones often lie dormant a year. Many hardy kinds are increased 

 by division, in September. See Auricula. 



Pritchardia. Palmaceoe. 



Grown from imported seeds. See Palms, page 377. 



Protea. Proteacece. 



Propagated by imported seeds. 



Prune (Prunus domestica). Rosaceaz. 



Prunes are plums. The commercial product is a dried plum. 

 Propagation in all ways as for other kinds of plums. 



Prunus (Almond. Apricot. Cherry. Peach. Plum). Rosaceoe. 



The dwarf almonds (Amygdalus) are increased by seeds, division, 

 cuttings, and by budding on 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 



