176 VINES 
The trellis for this vine is best about a foot away 
from the wall, so that a free circulation of air is 
permitted around the stems, which must be 
thoroughly ripened to ensure flowers. 
A good winter-flowering type is B. venusta, 
on which the orange-crimson flowers are borne 
in large drooping spikes. ‘This species requires 
a house a little warmer than the cross vine, but, 
because of its free-flowering character, is one 
of the best rafter plants we have. Another 
good species requiring a considerable degree of 
heat is B. purpurea, in which the small size of 
the flowers is balanced by their exceptionally 
attractive purple and white colouring. Other 
useful variations are B. buccinatoria, which, 
with its exceedingly long, deep-red and yellow 
flowers, does best in a cool house, and B. speciosa, 
which, in a somewhat warmer atmosphere, bears 
freely yellowish and lilac flowers. 
Although a fastidious plant out of doors, the 
clematis can with impunity be roughly handled 
in a greenhouse where the conditions suit it 
exactly. Plant the vine in a thoroughly enriched 
border and train to a wire trellis. It can be made 
to cover the supports and rafters. The most 
satisfactory temperature is 45° or 50° in the 
winter while the plant is resting. After the 
