Conifers : Size of Container
Container Grown Conifers
Container grown plants are defined by ‘C’ followed by a number indicating the volume in litres, e.g. C5.
(Sometimes reference is made to pot grown plants. ’Pot‘ refers to a small container, less than 2 litres in volume typically used in propagation. Pot grown plants are defined by ’P‘ followed by a number indicating the upper, outside width in cm, typically ranging from 5-13 cm. P9 is a typical small size, containing approx. 0.5 litres of growing medium.)
The volume of cell grown plants is indicated in cubic centimetres (cc).
Forestry conifers are also grown in Japanese Paper Pots (JPP’s). Typically these come in three sizes; 100 ml; 125 ml; and 235 ml
Cell Grown Conifers

Figure 1: CELL GROWN CONIFER
(Picea sitchensis, 100 cc cell, 20-40 cm)
Type
|
Volume |
Overall height (cm) |
| Cell |
50 cc |
10-20 |
| Cell |
100 cc |
20-40 |
| Cell |
200 cc
|
40-60 |
Container Grown Conifers
| Type |
Volume in litres |
Note |
| JPP |
0.1 |
|
| JPP |
0.125 |
|
| JPP |
0.235 |
|
| C |
0.5 |
Also known as P9 |
| C |
1 |
Also known as P11 |
| C |
1.5 |
Also known as P13
|
| C |
2 |
|
| C |
3 |
|
| C |
4 |
|
| C |
5 |
|
| C |
7.5 |
|
| C |
10 |
|
| C |
15 |
|
| |
|
|
| |
|
|
The most typical size of containers used for conifers are indicated in bold type.
Larger trees are available by personal selection, contract growing and speculatively. No standards are available for these trees and personal selection is encouraged.