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Kelly M. Stanton, Sally S. Weeks, Michael N. Dana and Michael V. Mickelbart

, respectively. Trees can also cast considerable shade. Based on these varying light patterns, there is demand for shade-adapted flowering plants in urban landscapes ( Schwartz, 1997 ). The native shrubs S. alba (meadowsweet) and S. tomentosa (hardhack or

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Michael V. Mickelbart, Michael J. Gosney, James Camberato and Kelly M. Stanton

The native shrubs Spiraea alba (meadowsweet) and S. tomentosa (hardhack or steeplebush) grow to be 1 to 1.5 m tall with long-lasting terminal inflorescences (white and pink flowers, respectively) present throughout most of the summer. Both

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Kelly M. Stanton, Sally S. Weeks, Michael N. Dana and Michael V. Mickelbart

Two native shrubs, meadowsweet (Spiraea alba) and steeplebush (Spiraea tomentosa), are currently grown for use in habitat restoration. Pruning could improve their form and encourage use in more formal gardens. Two seedling populations of each species were grown in the field or in containers outdoors. In Mar. 2009, plants were pruned to 3 or 15 cm or were left unpruned. By midsummer, there was no effect of pruning on plant height in field-grown plants. However, pruning did eliminate lateral growth in field plants and, therefore, improved overall form of the plants. Meadowsweet pruned to 3 cm had about half as many inflorescences as did meadowsweet pruned to 15 cm, with unpruned plants producing an intermediate number of inflorescences. Pruning container plants to 3 cm resulted in plants that were about half the height of unpruned plants, and total biomass was greatly reduced. In general, plants that were pruned had fewer inflorescences, although the total number of inflorescences in all plants was small. Pruning resulted in lower quality plant form in container plants. Species and seed sources within species responded similarly to pruning. Based on the data collected in this study, newly planted meadowsweet and steeplebush should be pruned to achieve good form in the first year. Despite the sometimes leggy growth habit in containers, these species should not be pruned before growing out in the spring, or maximum growth and good form will not be attained.