188 
LIST OF GREENHOUSE SHRUBS. 
wood ; fix a common frame in a warm situation, fully exposed to the sun, place a 
foot thickness of soil round it to prevent the frost from making- an entrance, make 
a dry bottom of broken stone, and lay about a foot thickness of dry sand, in which 
plunge the roots in rows, as thick as they can be conveniently placed, cover them 
with lights, and with mats whenever there is danger of frost. If the cultivator 
possesses no frame a box will answer the purpose, placing the plants close together, 
and setting the box in the window of a shed or other room, where light is admitted, 
giving them no water until the following March ; and, by the second week of May, 
they may again be planted in the open border, where they will grow vigorously and 
flower very finely. 
18. Another way of preserving them is, to take them up from the borders on 
the approach of winter, to shake the soil from the roots, and hang them up in a 
cellar, or other dark room, not alfected by changes of weather, until the season of 
planting out again in May. When planted out, let them be sheltered from the 
light and sun for a day or two, and afterwards gradually exposed, as they become 
strong. 
19. Perhaps as good a way as any is to raise a quantity of young plants, in 
preference to taking the old roots up ; to do this successfully, take off in September 
or October as many cuttings as will be necessary for the next year's use, and plant 
them in a light soil, under a hand-glass, on a warm south border. Shelter them 
a while until they have begun to grow, which will be in little more than a week ; 
in winter, be careful not to overwater them; keep them clean from dead leaves; 
cover them safely with a mat in frosty weather ; give them air in favourable 
weather ; and, when the weather becomes fine in the spring, gradually expose them, 
until they will bear the open air ; after which, plant them out in the places appointed 
for them. If it is not convenient to plant them under a hand-glass, use a flower- 
pot for the purpose, giving a good drainage, by half-filling the pot with broken 
potsherds, and afterwards placing it in the window of a house, or any other con- 
venient place, until the following spring. 
20. If the time of taking off the cuttings should chance to be prolonged until 
the frosts have nipped the plants, if not very severely cut, they may still be 
propagated ; it will be observed, that although the plants appear to be killed, there is 
usually at the extremity of each of the branches a piece about an inch or more long 
which appears perfectly fresh and green ; let these ends be taken off and planted as 
speedily as possible, or they will quickly perish for want of nourishment. 
PROTEA. 
For the successful culture of this genus, see Vol. I., page 231. 
PODOLOBIUM. 
P. TRILOBATA should be treated precisely in the same manner as Gompho- 
lobium, &c. 
PULTENjEA. 
These species require the same treatment as the last. 
POLYGALA. 
A very pretty genus of easy growing plants, requiring to be potted in a soil 
composed of two parts heath mould, one part rotten leaves, and one part very light 
