Conifers – Size of Container

NPS Conifers Container Size

NPS conifers container size
Cellgrown Conifer

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 100 ml, 125 ml or 235 ml sizes.

Larger trees are available by personal selection, contract growing and speculatively. No standards are available for these trees and personal selection is encouraged.

Cell grown Conifers

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