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guide to container size

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Any container of which any one of three dimensions (i.e., height, inside top diameter, and inside bottom diameter) does not fall within the below specifications.

Nursery Plant Container or Pot Sizes
The following plant container maximum and minimum dimensions are the limits recommended for plant containers classes as #1, #2, #3, #5, #7, and #15. The three dimensions are height, inside top diameter, and inside bottom diameter.

Container Class Vertical Height
(Max. - Min.)
Inside Top Diameter
(Max. - Min.)
Inside Bottom Diameter
(Max. - Min.)
#1 7.00" - 6.00" 7.50" - 6.00" 6.00" - 5.00"
#2 8.75" - 7.50" 8.75" - 7.50" 7.75" - 6.50"
#3 10.00" - 8.50" 10.00" - 9.50" 9.50" - 8.50"
#5 12.50" - 11.00" 12.00" - 9.75" 10.25" - 8.75"
#7 12.50" - 11.00" 14.00" - 12.25" 12.25" - 11.00"
#15 18.00" - 15.00" 17.25" - 15.00" 14.50" - 13.50"
 
shade trees
Types 1 & 2
caliper minimum diameter ball & basket
1/2 in. 12 in.
3/4 in. 14 in.
1 in. 16 in.
1 1/4 in. 18 in.
1 1/2 in. 20 in.
1 3/4 in. 22 in.
2 in. 24 in.
2 1/2 in. 28 in.
3 in. 32 in.
3 1/2 in. 38 in.
4 in. 42 in.
4 1/2 in. 48 in.
5 in. 54 in.
5 1/2 in. 57 in.
6 in. 60 in.
7 in. 70 in.
8 in. 80 in.
  7 in.
  8 in.
 
trees
Types 3 & 4
height (up to 6 ft.)
caliper (6 ft. & over)
minimum diameter ball & basket
2 ft. 10 in.
3 ft. 12 in.
4 ft. 14 in.
5 ft. 16 in.
3/4 in. 16 in.
1 in. 18 in.
1 1/2 in. 20 in.
1 3/4 in. 22 in.
2 in. 24 in.
2 1/2 in. 28 in.
3 in. 32 in.
3 1/2 in. 38 in.
4 in. 42 in.
4 1/2 in. 48 in.
5 in. 54 in.
5 1/2 in. 57 in.
6 in. 60 in.
70 in.  
80 in.  
 
spreading, semi-spreading & globe or dwarf broadleaf evergreens
Types 1, 2, 3
spread minimum diameter ball & basket
18 in. 10 in.
2 ft. 12 in.
2 1/2 in. 14 in.
3 ft. 16 in.
3 1/2 in. 18 in.
4 ft. 21 in.
 
cone & broad up-right broadleaf evergreens
Types 4 & 5
height minimum diameter ball & basket
18 in. 10 in.
2 ft. 12 in.
3 ft. 14 in.
4 ft. 16 in.
5 ft. 20 in.
6 ft. 22 in.
7 ft. 22 in.
8 ft. 27 in.
9 ft. 30 in.
10 ft. 34 in.
12 ft. 38 in.
14 ft. 42 in.
16 ft. 46 in.
18 ft. 50 in.
 
spreading, semi-spreading & globe or upright dwarf conifers
Types 1, 2, 3
spread minimum diameter ball & basket
9 in. 8 in.
12 in. 8 in.
15 in. 10 in.
18 in. 10 in.
2 ft. 12 in.
2 1/2 ft. 14 in.
3 ft. 16 in.
3 1/2 ft. 18 in.
4 ft. 21 in.
5 ft. 24 in.
6 ft. 28 in.
7 ft. 32 in.
8 ft. 36 in.
 
conical & broad conifers
Types 4 & 5
height minimum diameter ball & basket
12 in. 10 in.
18 in. 10 in.
2 ft. 12 in.
3 ft. 14 in.
4 ft. 16 in.
5 ft. 20 in.
6 ft. 22 in.
7 ft. 24 in.
8 ft. 27 in.
9 ft. 30 in.
10 ft. 34 in.
12 ft. 34 in.
14 ft. 42 in.
16 ft. 46 in.
18 ft. 50 in.
 
single stem trees
Types 1, 2, 3
caliper minimum diameter ball & basket
1/2 in. 10 in.
3/4 in. 10 in.
1 in. 12 in.
1 1/4 in. 14 in.
1 1/2 in. 16 in.
1 3/4 in. 18 in.
2 in. 20 in.
2 1/2 in. 20 in.
3 in. 28 in.
 
small spreading trees
Type 4
height (ft.)
caliper (in.)
minimum diameter ball & basket
2 ft. 10 in.
3 ft. 10 in.
4 ft. 12 in.
5 ft. 12 in.
3/4 in. 12 in.
1 in. 14 in.
1 1/2 in. 14 in.
1 1/4 in. 14 in.
1 3/4 in. 18 in.
 
columnar conifers
Type 6
regular growing rapid growing
height minimum diameter ball/basket height

minimum diameter ball/basket

12 in. 10 in. 12 in. 8 in.
18 in. 10 in. 2 ft. 9 in.
2 ft. 12 in. 3 ft. 9 in.
3 ft. 13 in. 3 ft. 9 in.
4 ft. 14 in. 4 ft. 12 in.
5 ft. 16 in. 5 ft. 14 in.
6 ft. 18 in. 6 ft. 16 in.
7 ft. 20 in.    
8 ft. 22 in.    
9 ft. 24 in.    
10 ft. 27 in.    
12 ft. 30 in.    
14 ft. 33 in.    
16 ft. 36 in.    
18 ft. 40 in.    
 
deciduous shrubs
Plants dug to the specifications in this table should have the center of the stem or cluster of stems of the plant in the center of the earth ball. A tolerance of 10% of the diameter is the maximum deviation allowable.
height minimum diameter ball & basket
12 in. 8 in.
18 in. 9 in.
2 ft. 10 in.
3 ft. 12 in.
4 ft. 14 in.
5 ft. 16 in.
6 ft. 18 in.
7 ft. 20 in.
8 ft. 22 in.
9 ft. 24 in.
10 ft. 26 in.

 

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