Eighteen species and hybrids of Syringa were renovated by removing all stems. At the end of 4 years, shoot growth, shoot diameter, and numbers of lateral shoots produced were evaluated to assess species differences in growth response. In most species, there was an initial rapid growth rate followed by a decline. The decline in growth rate may be related to increasing architectural complexity as the shoot system develops. Genotypic differences in stem diameter, height growth progression and the number of lateral shoots have a principal role in plant form development and should be considered when selecting plants with particular textural characteristics for landscape plantings. In addition, these response patterns may be a useful guide for predicting growth and development after renovation of a particular species and hybrids.

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Author notes

2Research Scientist, Landscape Plant Materials.

3Associate Professor, Department of Plant Science, University of Manitoba, Winnipeg, Manitoba, Canada, R3T 2N2.