Shrubs – Summary

This table gives information typically used in the specification of shrubs.  It is important to realise that plants are variable and growth varies between species and seasons.  For this reason, the details within the table give general, accepted dimensions and terms for the specification of shrubs but there are always well grown and health plants which are exceptions.  A knowledge of the product and its production methods are important factors when specifying plants.

Values shown in bold type indicate the more typical for the range.

NPS Shrubs Summary

AGE/CONDITION or x TRANSPLANTED OVERALL HEIGHT ROOT CONDITION SIZE OF CONTAINER HABIT NUMBER OF BREAKS NOTES
in cms(D) = diameter B = bagged (bareroot)
Ce = cell grown
RB = rootball
C = container
Minimum size range given in LITRES unless otherwise indicated
1+0 or 1/0 10-15, 15-20, 20-25, 25-30,30-40, 40-50, 50-60,60-80 B Sometimes grown LOW DENSITY to get a more robust plant
1+0 or 1/0 10-20, 20-40, 40-60, 60-90
15-30
Ce 100, or 200 cc. A useful forestry product
0/1 40-50, 60-80, 80-100, 100-125 B Useful landscape product
0/2 60-80, 80-100, 100-125, 125-150 B Not so commonly grown
1+1 or 1/1 30-40, 40-50, 60-80,80-100, 100-125 B or C 1, 2 or 5 Used for some species which resent transplanting
20-30, 30-40, 40-60, 60-80, 80-100, 100 + B 3, 4 or 5 Compact, low, medium and vigorous species/cvs.
15-30, 30-50, 50-80 B Transplants
25-40, 40-70, 70-90 B 2 or 3 depending on height and vigour Light shrubs
Height or spread in cm: 10-15, 15-20, 20-25, 25-30, 30-40, 40-50, 50-60, 60-70, 70-80, 80-100, 100-125, 125-150, 150-175, 175-200, 200-225, 225-250, above 250 in 50 cm steps, above 400 in 100 cm steps. RB Branched; Bushy; 2, 3/4, 5/7, 8/12 depending on height, age and growth habit. Low/compact species/cvs.
e.g.Cotoneaster ‘Coral Beauty’;Genista lydia ;Potentilla ‘Elizabeth
Height or spread in cm: 15-20, 20-30, 30-40, 40-60, 60-80, 80-100, 100-125, 125-150, 150-175, 175-200, 200-225, 225-250, above 250 in 50 cm steps, above 400 in 100 cm steps. RB Branched; Bushy; Leader and Laterals; Several Shoots; Single Leader; 2, 3/4, 5/7, 8/12 depending on height, age and growth habit. Medium species/cvs.
e.g. Berberisthunbergii,Cytisusscoparius;Escallonia’Slieve Donard’; Euonymusalatus
Height or spread in cm: 20-30, 30-40, 40-60, 60-100, 100-150, 150-200, 200-250, 250-300, 300-400, above 400 in 100 cm. steps. RB Branched; Bushy; Leader and Laterals; Several Shoots; Single Leader; 2, 3/4, 5/7, 8/12 depending on height, age and growth habit. Vigorous species/cvs.
e.g.Cotoneaster ‘Cornubia’;Elaeagnus xebbingei;Hippophaerhamnoides; Hydrangeapaniculata
Spread in cm:
10-15, 15-20, 20-(25), (25)-30, 30-40, 40-50, 50-60, 60-80
RB Branched; Bushy; Several Shoots; 2, 3/4, 5/7, 8/12 depending on height, age and growth habit. Ground cover species/cvs.
e.g. Ceanothusthyrsiflorusrepens; Cotoneasterdammeri; Euonymusfortunei cvs.
Height or spread in cm: 10-15, 15-20, 20-25, 25-30, 30-40, 40-50, 50-60, 60-70, 70-80, 80-90, 90-100, 100-120 RB Branched; Bushy; 4, 5/7, 8/12 depending on height, age and growth habit. For genusRhododendron
Low/compact and medium :
Height or spread in cm. 30-40, 40-50, 50-60, 60-70, 70-80, 80-90, 90-100, 100-120, 120-140, 140-160, 160-180, 180-200, 200-225, 225-250, 250-275, 275-300, above 300 in 50 cm steps. RB Branched; Bushy; 4, 5/7, 8/12 depending on height, age and growth habit. For genusRhododendron Vigorous :
Height in cm: 30-40, 40-50, 50-60, 60-70, 70-80, 80-100, 100-125, 125-150, 150-175, 175-200, 200-250, 250-300 RB Branched; Bushy; 4, 5/7, 8/12 depending on height, age and growth habit. Deciduous azaleas
Spread in cm: 15-20, 20-25, 25-30, 30-40, 40-50, 50-60, 60-70, 70-80, 80-90, 90-100, 100-120, 120-140 RB Branched; Bushy; 4, 5/7, 8/12 depending on height, age and growth habit. Japanese azaleas
Height in cm: 10-15, 15-20, 20-30, 30-40, 40-60, 60-80, 80-100 C 0.5, 1, 2, 3, 4, 5, 7.5, 10, 15, or larger sizes for specimen shrubs Branched; Bushy; Leader and Laterals; Several Shoots; Single Leader; Branched, Several Shoots: 2-3; Bushy: 3-6; depending on height, age and growth habit.
Rhododendron: 4-10
Typical container grown shrubs specified by overall height. For Specimen shrubs both height and spread may be specified
Diameter in cm.10-15, 15-20, 20-25, 25-30, 30-40 C 0.5, 1, 2, 3, 4, 5, 7.5, 10, 15, or larger sizes for specimen shrubs Branched; Bushy; Several Shoots; Branched, Several Shoots: 2-3; Bushy: 3-6; depending on height, age and growth habit.
Rhododendron: 4-10
Typical container grown shrubs specified by overall spread. For Specimen shrubs both height and spread may be specified
Other details

Where appropriate other criteria can be specified. The following are examples:

Criterion Qualification Notes
Origin/Provenance British grown
British Provenance
Local Provenance
Refer to Part 1. Note that British grown is not reliably British provenance or origin
Shape Cone
Sphere
Spiral
Pyramid
Other shapes
More detailed information on the other criteria necessary for the specification of these shapes (girth measures, branch lengths, root condition, size of container, etc.) can be obtained from the specialists who supply these shrubs. Buxus spp., Taxus spp. Laurus spp Crataeguslaevigata cvs., Malus cvs.
Roses Budded – bagged (bare root) Further Criteria for specification
BUSH Quality A or Quality B
or
STANDARD Quality A or Quality B
Budded – Container grown – C3 minimum Further Criteria for specification
BUSH Quality A or Quality B
or
STANDARD Quality A or Quality B
Cutting raised – bagged (bare root) Further Criteria for specification
Strong growing or Slow growing
Cutting raised – Container grown – C1 minimum Further Criteria for specification:Strong growing or Slow growing