All standards of nursery stock apply to container grown stock, i.e. grading, size, type, spread and height.
The size of the container must be specified in addition to size of plant. For container sizes see table below. Containers must meet both dimensional and volume measurements to be compliant.
|Container Class||Height Min. (cm) Max.||Inside Top Diameter Min. (cm) Max.||Inside Bottom Diameter Min. (cm) Max.||Container Volume Min. Max. (cubic cm)|
|#1||15 - 18||15 - 19||12 - 13||2492 - 4115|
|#2||19 - 23||19 - 23||16 - 20||5246 - 7770|
|#3||22 - 26||22 - 26||21 - 23||10285 - 12164|
|#5||28 - 32||24 - 31||22 - 26||12860 - 20360|
|#7||28 - 32||31 - 36||28 - 31||21913 - 29343|
|#10||37 - 39||38 - 40||38 - 40||34090 - 43376|
|#15||38 - 46||38 - 44||34 - 37||45376 - 60589|
|#20||50 - 52||43 - 45||43 - 45||74096 - 84457|
|#25||34 - 46||58 - 60||57 - 59||94669 - 112472|
Plants must be grown in the container for a minimum of three months or have a well established root system reaching the sides of the container to maintain a firm ball. In the case of dormant roses, it is generally acceptable that plants may be potted and forced for sales in less than 3 months.
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Minimum standards for the nursery industry, for use by students, educators and professionals.
An independent industry body with a mandate to administer nursery certification programs in Canada.