For the majority of the criteria, grading standards and measures have been developed and accepted for the usual specification of shrubs. However, in some instances it may be necessary to specify other details. The following is a list of some of the more typical extra specification requirements which might be used. These should be considered to be indicative and not comprehensive.
Origin and Provenance
These terms are of particular importance in the specification of native (indigenous) plants or plants which are required from a known source of propagation material.
Origin is defined as “the place in which indigenous plants are growing or the place from which non-indigenous plants were originally introduced.”
Provenance is defined as “the place in which any plants, whether indigenous or non-indigenous are growing.”
It is not appropriate to specify particular origin/provenance speculatively. A limited number of specialist growers are producing native species and may be listed as sources. Specifications should be developed following discussions with specialists (ecologists and growers) and then contract grown to precise requirements. It is easiest to specify the required provenance (indicating the exact source of the young plants or propagation material) if this is significant to the project as the establishment of origin is complex and currently the topic of research.
Current British Standards indicate that the ‘country of origin’ is the country where the plant has been growing for the latter half of the most recent growing season. If this is not sufficient, it may be necessary to require information about the provenance of the propagation material (seed, cuttings, budwood, grafts, etc.) in the specification.
Habit indicates the natural or most typical shapes in which shrubs can be bought. However there are other shapes of shrubs and the following gives some examples of the more common types:
|Cone||Buxus spp., Taxus spp., Laurus spp.|
|Pyramid||Crataegus laevigata cvs., Malus cvs.|