396 THE NURSERY-MANUAL 



seeds. Hand-pollination and cross-fertilization produce a reason- 

 able quantity of seed. The different varieties are readily cross- 

 pollinated, making it possible to secure an endless extent of varia- 

 tion within the limits of the different varieties. This seed can be 

 germinated readily under greenhouse conditions. The method 

 of handling the seeds is simple. They should be removed from the 

 ripe fruit and planted singly, preferably in thumb-pots, and plunged 

 in well-drained beds. A sphagnum-moss covering may be used to 

 maintain the moisture. As soon as the seeds have germinated, the 

 moss may be removed and overhead watering discontinued. Half 

 shade should be maintained. As soon as a sufficient growth has 

 been made, the seedlings may be shifted from time to time to larger 

 pots. The seedlings are delicate and subject to damping-off, 

 and other adverse conditions, but after they are four to six months 

 old they become rather robust and no great care need be exercised. 

 Over-watering is one of the most fruitful sources of failure with 

 seedlings. The most precocious seedlings may come into bearing 

 thirty months from the time the seed was planted. As soon as 

 the seedlings come into fruiting, the multiplication is somewhat 

 certain and rapid. It varies greatly with different individual 

 plants. Usually those that produce the smallest and poorest 

 fruits have the largest number of suckers and slips. 



Pinguicula (Butterwort). Lentibulariacece. 



The species mostly seen in collections, P. caudata, is propagated 

 easily by leaf -cuttings. The leaves are broken clean from the stem 

 and laid flat in pans of sand protected by glass, the pan being placed 

 in a tray of water. When the roots have formed, the plants may be 

 potted off. All the species may be grown from seeds when these are 

 to be had. 



Pink: Carnation, Dianthus. 



Pinus (Pine). Pinacece. 



Seeds, which should be kept dry over winter, are commonly 

 employed. These are often started in pots, but for most species they 

 are sown in well-prepared beds outdoors. The seedlings must usually 

 be shaded the first season. Varieties, as also species that do not 

 produce seed freely, may be grafted on stocks of white or Aus- 

 trian pine or other species. This grafting may be performed on the 

 tips of growing shoots early in the season, but it is more often practiced 

 on potted plants by the veneer method. Pinus Strobe should be 



