380 THE NURSERY-MANUAL 



Parsnip (Pastinaca saliva). Umbelliferce. 



Grown from fresh seeds, sown where the plants are to stand. 

 Parthenocissus, Psedera. Vitaceoe. 



Propagated by seeds, hardwood cuttings and layers ; P. tricuspi- 

 data and its varieties from greenwood cuttings ; Virginia creeper (P. 

 quinquefolia) and similar kinds by hard cuttings. See Ampelopsis. 



Passiflora (Passion-Flower). Passifloraceoe. 



Increased by seeds, sown under glass. Cuttings of the young 

 growth taken from the middle of January until April root easily in 

 sand in a frame. Varieties are sometimes veneer-grafted on related 

 stocks. P. ccerulea propagates by root-cuttings. 



Paullinia. Sapindaceoe. 



Propagated by cuttings of young shoots in spring. 



Paulownia. Scrophulariaccw. 



Propagated by seeds, sown in spring in carefully prepared soil, 

 either in a seed-bed or in a coldframe. Cuttings of ripe wood or of 

 roots made in fall or spring are used ; also leaf -cuttings, inserted in 

 sand under a glass in a propagating-house, the young unfolding 

 leaves being used for this purpose when about an inch long and 

 cut off close to the petiole. 



Pavetta. Rubiacece. 



Propagated by cuttings of half-ripened shoots in sharp sand 

 in a warm moist house. 



Pavonia. Malvaceae. 



Propagated by cuttings in spring or early summer ; also by seeds 

 when obtainable. 



Pea (Pisum sativum). Lcguminosce. 



Raised from seeds, sown where the plants are to stand. The plants 

 are hardy and seeds may be sown very early, and deep. For cow- 

 pea, see Vigna. 



Peach and Nectarine (Prunus Persica). Rosaceos. (H. P. Gould). 

 The peach is perhaps the easiest to propagate of all the widely 

 grown tree-fruits. Propagation is universally by shield-budding 

 and, as a rule, on seedling peach stocks, although hard-shell almond 

 seedlings have been used somewhat in California where it is said 



