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Corylus avellana (Common Hazel)
| Date | Action |
| May 23 2009 | Jewell (5504) added "5a (to -15 F / -26 C)" to Zones / Hardiness |
| May 23 2009 | Jewell (5504) added "5b (to -10 F / -23 C)" to Zones / Hardiness |
| May 23 2009 | Jewell (5504) added "6a (to -5 F / -21 C)" to Zones / Hardiness |
| May 23 2009 | Jewell (5504) added "6b (to 0 F / -18 C)" to Zones / Hardiness |
| May 23 2009 | Jewell (5504) added "7a (to 5 F / -15 C)" to Zones / Hardiness |
| May 23 2009 | Jewell (5504) added "7b (to 10 F / -12 C)" to Zones / Hardiness |
