Corm sizes are approximately the following diameters:
| In the USA | In Europe (Holland) | In Russia | |||
| Group | Corm diameter | Group | Corm diameter | Group | Corm diameter |
| Extra | 2” / 5,1 cm or larger |
Extra | 6.3” / 16 cm or larger |
1 | 1.18” / 3,2 cm or larger |
| 1 | 1”-2” / 3,8-5,1 cm |
Large | 3.9”-6.2” / 10-16 cm |
2 | 0.79”-1.18” / 2,5-3,2 cm |
| 2 | 1.25”-1.5” / 3,2-3,7 cm |
Medium | 2.4”-3.9” / 6-10 cm |
3 | 0.4”-0.79” / 1,5-2,5 cm |
| 3 | 1”-1.25” / 2,5-3,2 cm |
Small | 1.8”-2.4” / 4-6 cm |
4 | 0.3”-0.4” / 1-1,5 cm |
| 4 | 0.75”-1” / 1,9-2,5 cm |
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| 5 | 0.5”-0.75” / 1,3-1,9 cm |
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| 6 | under 0.5” / 1,3 cm |
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© Irina Antipina, 2003-2012
