We have found the most effective method to be by placing the cuttings in
a bottle of water, and keeping them in a sunny window, but the following
method is said to be practiced by cottagers in the west of England: "In
the autumn, after the frost has destroyed the foliage, the wood of the
present season is cut off close to the ground and laid like a sheaf of
corn in a trench a foot deep. The bundle is covered with a few inches of
soil, and here it remains until spring, when a multitude of young shoots
may be seen pushing their way through. The soil is then carefully moved,
and with a sharp knife a cut is made each side of a joint, and the
result is rooted plants enough for the parish. The old stool throws up
more vigorously than before, to be served in the same way the following
autumn."
A Talk About Coleuses.