DECIDUOUS FLOWERING SHRUBS 35 
the space is limited a very few will suffice. All that 
will be here recommended are quite hardy and will 
thrive in any good garden soil, although a deep moist 
loam is the most suitable for them. They can be 
readily increased by layering at the end of the summer 
or by cuttings of the ripened wood in the autumn. 
They are admirably adapted for the formation of 
groups on the grass and they materially improve the 
shrubbery when planted singly or arranged in small 
groups in prominent positions. The strong growers 
make fine lawn specimens when planted singly. The 
two of special value are Viburnum Opulus sterilis and 
V. plicatum. ‘The first-named is the well-known Guelder 
Rose and is the sterile form of a fairly common British 
shrub. It reaches a height ranging from six to twelve or 
more feet according to the conditions under which it is 
grown, and when it has space for development it is 
decidedly elegant in contour, and it moreover produces 
its snowball-like flowers in greater profusion. Very 
frequently this handsome shrub proves unsatisfactory 
owing to it being planted in shrubberies where it is 
crowded up with other things. The only pruning 
necessary is the removal of the weakly wood during 
the winter. The second of the two forms mentioned 
is of Japanese origin and is especially useful for medium- 
sized lawn groups. When grown in the open it attains 
a height of from four to six feet, and when trained 
against a wall it will rise three or four feet higher. It 
blooms with wondrous freedom in May and the flowers 
are produced in globular heads and are pure white. 
V. macrocephalum if not so generally useful as the fore- 
going possesses considerable beauty and is well deserv- 
ing of culture. The species is of Chinese origin, forms 
a large bush and blooms in June, the flowers being 
white and arranged in pyramidal trusses. 
WEIGELA or Diervitta.—A small genus of Japanese 
