Phenological observations on Pyrus calleryana trees grown in the three pit types. Observations were carried out between mid-March and mid-December 2011 and 2012, and between mid-September and mid-December 2010.
| State | 2nd week March | 1st week April | 3rd week September | 3rd week October | 1st week November | 3rd week November | 1st week December | 3rd week December |
| Small covered pit Bud break Autumn color Leaf fall | Started | >60% | ∼12% | ∼40% | Peak | >30% | >80% | Completed |
| Large covered pit Bud break Autumn color Leaf fall | Started | >70% | ∼10% | ∼20% | ∼45% | Peak >20% | >50% | >90% |
| Open pit Bud break Autumn color Leaf fall | Started | >80% | ∼10% | ∼20% | ∼30% | Peak >15% | >40% | >80% |