Buds usually form only at the nodes of the stem and at the axil of the leaves, but some species develop buds under certain conditions at any point on the stem or root. These that may develop anywhere on stems, branches, and in some cases on the surface-roots, are called adventitious buds. The willows, some of the poplars, and elms are of this class, and among the fruits, plum, cherry, raspberry, and blackberry may develop such buds when cut back or wounded. This peculiarity is utilized by propagators in growing plants by root-cuttings and in some cases from the cuttings of the new or older wood.
Lateral buds of fruit-trees, and other trees and shrubs, form on the young growth and usually do not push into growth the same season. But if the points of growth are pinched or clipped they may be developed. Many of these lateral buds distant from the point of growth remain dormant and become overgrown the succeeding seasons. Such overgrown buds often push into growth after remaining dormant for several years. On the two-year-old wood of some fruit-trees, and of the cut-leaved birch, these dormant lateral buds are still quite prominent and can be utilized for grafting. In the propagation of the cut-leaved birch the two-year-old buds are used, as those on the new shoots are too small.