Aaron’s Rod. See [Verbascum].
Abelia. Caprifoliaceæ.
In spring by layers under a frame, and in summer by cuttings.
Abies (Fir, Spruce). Coniferæ.
Propagated by seeds, which are usually kept dry over winter and sown in spring in frames or in protected borders. Cones should be fully matured before being gathered. If they hold the seeds tightly they should be placed in a dry place, sometimes even in an oven, until the scales spread. In order to obtain stocky plants, the seedlings should be transplanted the following spring. The named varieties and the species which do not produce sufficient seed are winter-worked upon seedling stocks which are potted from the seed-beds in the fall. One-year-old stocks are commonly used, but in some cases the requisite size is not reached until the second year. Any of the common operations of grafting may be employed. The conifers are not difficult to graft. The European silver fir (Abies pectinata) may be used as a stock, but the common Norway spruce is now the most popular stock for species of both Abies and Picea.
Abobra. Cucurbitaceæ.
Propagated by seeds, or rarely by soft cuttings.
Abroma. Sterculiaceæ.
By seeds sown in March. By cuttings made in spring from half-ripened wood, and placed under a bell-glass.
Abronia (Sand Verbena). Nyctaginaceæ.