PLANTS WORTH GROWING 119 
In January or February of each year mulch the 
bed with an inch or two of short manure rubbed 
through a coarse sieve, and whenever the bed is 
dry during Summer give a good soaking, occasionally 
using liquid manure. After three years' growth 
measure the bed off into nine-inch strips, and after 
cutting down the sides carefully with a sharp spade 
remove both soil and roots from alternate strips, 
filling in with well-enriched soil. The portions 
left untouched on the first occasion will be cleared 
and refilled with soil three years later, and by 
continuing on these lines an excellent and prolific 
bed may be maintained on the same site for a period 
indefinite. 
Convolvulus. — Whilst the Annual Convolvulus is 
quite commonly seen in gardens, and is familiar 
in both its climbing and dwarf or Tom Thumb 
varieties, the Perennial Convolvulus of which there 
are several species is but seldom met with. As 
trailing plants the purple- and red-flowered kinds 
are beautiful and effective, and one named incanus 
has pretty silvery foliage which shows up finely 
against a dark background of soil. C. Mauritanieus 
is one of the nicest of the perennial species, the 
vine-like growths being studded with rich violet- 
purple flowers. A fairly rich soil and a steep slope 
down which the trailing growths can ramble suits 
the plant well, and there is no difficulty in their 
culture. 
Coreopsis. — Market growers and the florists' shops 
