Technical Specification
Measurement of tree girth

We are able to lift our trees from mid-October to mid-April, although we do recommend that tree planting takes place from November to March. Our trees are lifted only to order to help ensure that they leave ‘nursery-fresh’.

Bare-rooted   (B)
The majority of trees lifted from our fields are supplied bare-rooted with the roots bagged for protection. J A Jones uses exclusively the co-extruded bag with its tough black inner & white shiny outer surfaces. This is the best available and needless-to-say, plays a vital role in aiding the successful establishment of bare-rooted trees by preventing the roots from drying out.

Root-balled   (RB)
Trees of 10cm girth & above can be supplied with wire root-balls. The ball of soil enclosing the roots is secured by the use of Hessian & an un-galvanised wire net. This ensures that the soil remains in intimate contact with the roots throughout the transplanting & planting operations. Hessian root-balls are usually provided for trees below 10cm girth.

Approximate Root-ball Sizes & Handling Requirements: Root-balls can vary in size & weight, depending on soil type, preparation methods & soil moisture content, but as a guide for those trees supplied by J A Jones:

10-12cm girth  -     50-60cm diameter  -  manageable by one person
12-18cm girth  -     60-70cm diameter  -  a minimum of three people required for 16-18cm
18-25cm girth  -     70-90cm diameter  -  machine required

Bare-rooted vs. Root-balled
Bare-rooted enables most of the tree’s root-run to be lifted intact whereas root-balling limits the root-run only to the size of the root-ball. However, with certain species which are difficult to transplant, we would strongly advise that root-balling is specified above a particular size. A list of trees requiring root-balls can be found at the back of this guide.

Number of Times Transplanted
Regular transplanting of trees encourages a compact fibrous root system, thereby significantly improving the chances of successful establishment on site. Although dependent on type, growing regime, climate and so on, trees up to semi-mature should be transplanted once every three years.

Plants transplanted once are indicated with the symbol 1x, those transplanted twice with 2x and so on.

Specification

Seedlings/Cuttings/Transplants

Symbol             Definition
1+0                    1 year seedling 
2+0                    2 year seedling
0+1                    1 year cutting
0+2                    2 year cutting
1+1                    2 year transplant 1x
1+2                    3 year transplant 1x
2+2                    4 year transplant 2x
 

Girth       Commonly                            Height cm           Known as a...                          cm

                 Transplant                                30/125
Fthd         Whip/Feather                           80/350
6-8           Standard                                250/300
8-10         Standard                                250/300
10-12       Selected Standard                 300/350
12-14       Heavy Standard                    350/425
14-16       Extra Heavy Standard           425-600
16-18       Extra Heavy Standard           450/625
16-18       Extra Heavy Standard           450/625
18-20
       Extra Heavy Standard           450/650
20+
           Semi-Mature                          500+

Trees are specified by their girth in centimetres, measured at 1 metre above ground level. Clear stem height, that is, the distance from the ground to the lowest branch, is normally 1.8 to 2.0 metres between the size ranges 12-20cm girth. In contrast, a feathered tree (fthd) is supplied with branches furnished almost down to the ground.

The above heights are provided as a guide only as they vary depending on such aspects as species & growing regime.

Multi-stems  (ms)
Multi-stems are sold, not on the basis of girth, but on height and the number of stems. All multi-stems are provided root-balled to help ensure transplanting success.

Shrubs
At J A Jones, an integrated pest management regime involving biological control prevents such problems as vine weevil damage. Shrubs are packed either in non-returnable cardboard pallets or returnable metal cages. Although the latter take longer to load & hold less, the plants arrive nursery-fresh. This is because the cages remain permanently rigid & prevent the plants from ‘sweating’ in warm weather.

Typical Height Range in Centimetres

10-15              60-80                  175-200
15-20              80-100                200-225
20-30              100-125              225-250
30-40              125-150              250-300
40-60              150-175

Commonly used Pot Sizes in Litres

0.5  (P9)                5                    45
1     (P11)              7.5                 70
1.5  (P13)              10                  90
2                            15                120
3                            25                160