| May 23 2009 | Jewell (5504) added "20 to 40 feet (6 to 12 m)" to Spread (Maximum) |
| May 23 2009 | Jewell (5504) added "20 to 40 feet (6 to 12 m)" to Height (Maximum) |
| May 23 2009 | Jewell (5504) added "Tree" to Plant Types |
| May 23 2009 | Jewell (5504) added "Deciduous" to Plant Types |
| May 23 2009 | Jewell (5504) added "hazelnut" to Common Names |
| May 23 2009 | Jewell (5504) added "3a (to -35 F / -37 C)" to Zones / Hardiness |
| May 23 2009 | Jewell (5504) added "2b (to -40 F / -40 C)" to Zones / Hardiness |
| May 23 2009 | Jewell (5504) added "3b (to -30 F / -34 C)" to Zones / Hardiness |
| May 23 2009 | Jewell (5504) added "4a (to -25 F / -32 C)" to Zones / Hardiness |
| May 23 2009 | Jewell (5504) added "4b (to -20 F / -29 C)" to Zones / Hardiness |
