ALPINE PLANTS. 15 
prevented from lodging near it in the winter. 
Now we come to a section that requires 
rather special treatment, such as A. helvetica. 
This must be wedged tightly between stones 
(limestone preferred) well elevated and facing 
south. Leave plenty of room behind the 
plant in the chink of rock—to hold 
the soil for its roots—and let it have 
a plentiful supply of water during early 
summer; but avoid watering over the face of 
the plant as much as possible, or the foliage 
will turn quite brown, and the little rosettes 
will be destroyed. 
A. argentea (Syn. zmbricata) (Pyrenees). 
The treatment of this species differs from the 
preceding one. It requires a sunny position 
and a mixture of leaf-mould, sand, and fibrous 
loam in equal portions. It does not need to 
be wedged between stones, but should have a 
stone fixed behind it, so as to take away any 
moisture that may lodge near it. Small pieces 
of sandstone worked around the plants absorb 
any moisture that may rise which the plant 
does not require. A top-dressing of stones 
once or twice in the season is very beneficial. 
It keeps the plants warm in winter and 
