Table 2. Heights of trees (feet) grown for the first 2 years at Root’s Nursery in 9-cm (3.5-in.) shelters and at Nittany Trees in 9- and 18-cm (3.5- and 7-in.) shelters, compared to trees grown all 4 years without shelters (percentage of control).
Species, cultivarYears:FeetPercent
012341234
Root’s Nursery, 9 cm
Acer griseum3.23.85.25.15.799131116108
Cercis canadensis3.85.97.88.38.8161129123112
Cornus ‘Celestial’3.75.98.18.08.913712410296
Malus ‘Adirondack’4.04.76.16.76.71081089584
Magnolia ‘Merrill’3.64.97.17.88.1136162162144
Magnolia stellata1.02.95.76.27.0219265195155
Syringa ‘Summer Snow’3.03.44.55.86.411311910382
Nittany Trees, 9 cm
Carpinus caroliniana2.62.76.34.9*101160100
Cornus ‘Celestial’3.23.25.55.2*103117114
Cornus ‘Constellation’3.83.66.26.6*101108102
Magnolia stellata1.91.84.52.8*10416188
Prunus serrulata ‘Kwanzan’3.13.19.19.0101130107
Prunus subhirtella autumnalis3.73.68.98.695119108
Nittany Trees, 18 cm
Carpinus caroliniana2.62.87.47.3*105189149
Cornus ‘Celestial’3.23.26.46.8102137130
Cornus ‘Constellation’3.84.07.27.7111124119
Magnolia stellata1.92.15.63.2*119198102
Prunus serrulata ‘Kwanzan’3.13.18.910.3101126115
Prunus subhirtella autumnalis3.73.78.98.799118108
  • * Some trees exhibited dieback.

  • Metric equivalents: 1 ft = 30.5 cm.