PENNYROYAL. 



362 



PETUNIA. 



Pelargoniums are classified as (i) Show 

 and Decorative ; (2) Fancy ; (3) Zonal, 

 or Bedding ; (4) Variegated-leaved ; (5) 

 Ivy-leaved. The named varieties are far 



IVY PELARGONIUMS. 



too numerous to admit of mention of them 

 here. 



Pennyroyal. 



A variety of mint (Mentha pukgiuni) 

 cultivated chiefly as a medicinal herb, 

 although it is sometimes used in cookery. 

 It is propagated by division of the roots in 

 spring or autumn. It thrives in good loam 

 or good garden soil, and, if the soil be dry, 

 it requires watering, as it does best in a 

 moist situation. 



Penstemon (not. ord. Scrophulari' 

 nese). 



Useful herbaceous perennials for the 

 garden, bearing flowers of various colours, 

 and of graceful habit of growth. They are 

 propagated by seeds or cuttings and do 

 best in well-manured sandy loam. Al- 

 though hardy, young plants require pro- 

 tection in frames during the winter, and 

 even well-established plants are susceptible 

 to injury from wet weather, speedily 

 followed by sharp frost. It is better to 

 cover the roots with ashes during the cold 

 season. 



Perennials. 



Plants which do not require renewal 

 from seed from year to year are called 



perennials. There are two sorts, namely, 

 those which are not always visible above 

 ground, but die down to the ground every 

 year, and spring up again the year follow- 

 ing ; and those which do not die down, 

 but retain their leaves, as pinks, carnations, 

 saxifrages ; and these, on this account, are 

 called evergreen perennials. The first sort 

 are known as Herbaceous Perennials. 



Perennials, Herbaceous. See. 



Herbaceous Perennials. 

 Periwinkle. See Vinca. 



Petunia (nat. ord. Solana'cese). 



There is very little difficulty in the 

 culture of this half-hardy, soft-wooded 

 plant, which may be propagated from 

 seeds sown in the spring, and treated in 

 precisely the same manner as that pre- 

 scribed for raising half-hardy annuals, or 



it may be grown from cuttings struck in 

 gentle heat in early spring, or without heat 

 in August and September. Both single 

 and double varieties are beautiful in ap- 

 pearance, and may be used for borders, 

 bedding-out purposes, and pot culture. 



