nus_ are also dark blue, but, as
with the other blue-fruited species, they are not frequently borne in
profusion in the average climate of Britain.

VITIS HETEROPHYLLA and its variety _humulifolia_, bear singularly
beautiful clusters of pale china-blue berries. To induce them to fruit
freely, however, the plants require a warm, sunny wall, and rather
restricted root-room.

CHAPTER XII

WEEPING TREES AND THEIR USES

It is not at all easy to define special uses for trees of weeping habit,
but it is safe to use them nearly singly and not in immediate connection
with trees of quite upright form. The point in the weeping tree is a
certain grace of drooping line, such as one enjoys in the drooping
racemes of many of the papilionaceous flowers such as Wistaria,
Laburnum, and Robinia. Nothing is gained by accentuating the peculiarity
by a direct association with trees of an opposite way of growth. It is
better rather to place the weeping trees near rounded masses of shrub
and small tree--for example, a Weeping Birch would group well with a
clump of Rhododendrons.

Near water weeping trees seem to be specially effective. An instance of
this is shown in the familiar Weeping Willow, but one at a time seems as
much as is wanted.

As a general rule, we strongly advocate planting in groups, whether in
the case of trees, shrubs, or flowering plants, but the weeping trees
are less suited for grouping than any others. One Weeping Willow is all
very well, but a whole grove of them would be monotonous and tiresome.

[Illustration: _ELAEAGNUS PUNGENS (Kew)._]

The habit of some of the weeping trees can be directly turned to
account in the making of arbours and pergolas; for by planting the
large-leaved Weeping Elm or the Weeping Ash at the back and on each side
in the case of an arbour, or alternately on each side of the walk for a
pergola, a living shelter may be made in a very few years. The trees in
this case are standards pollarded at about 8 feet from the ground, the
form in which they are generally sent out from the nursery.

[Illustration: _CORNUS MAS VAR. VARIEGATA (Variegated Cornel)._]

Among evergreens the Holly is invaluable. As a rule the weeping or
pendulous varieties are budded on tall stems of the type, and trained
out in an umbrella-like fashion, thus forming a hollow mound of
greenery. In some places, notably at Brookwood in Surrey, pendulous
Hollies have been allowed to grow without any attempt at tra