By Layering
This is a very convenient method of increasing such varieties as will
not grow readily from cuttings; and vines thus propagated will, if
treated right, make very good plants. To layer a vine, shorten in its
last season's growth to about one-half; then prepare the ground
thoroughly, pulverizing it well; then, early in spring make a small
furrow, about an inch deep, then bend the cane down and fasten it
firmly in the bot
om of the trench, by wooden hooks or pegs, made for
the purpose. They may thus be left, until the young shoots have grown,
say six inches; then fill up with finely pulverized soil or leaf-mould.
The vines will thus strike root generally at every joint. The young
shoots may be tied to small sticks, provided for the purpose, and when
they have grown about a foot, their tips should be pinched off to make
them grow more stocky. In the Fall they are taken up carefully,
commencing to dig at the end furthest removed from the vine, and
separate each plant between the joints, so that every shoot has a
system of roots by itself. They are then either planted immediately, or
heeled in as described before.