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Pruning of Meadowsweet and Steeplebush

机译：Meadowsweet和Steeplebush的修剪

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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.
机译：目前正在种植两种原生灌木，草草甸甜菜（Spiraea alba）和尖顶灌木（Spiraea tomentosa），用于栖息地恢复。修剪可以改善其形状，并鼓励在更正式的花园中使用。每个种类的两个幼苗种群在田间或在室外的容器中生长。在2009年3月，将植物修剪到3或15厘米或不修剪。到仲夏，修剪对田间生长的植物的株高没有影响。但是，修剪确实消除了田间植物的侧向生长，因此改善了植物的整体形态。修剪到3厘米的草甸甜花的花序大约是修剪到15厘米的草甸甜花的一半，未修剪的植物产生中等数量的花序。将容器植物修剪到3厘米，结果植物的高度约为未修剪植物的高度的一半，总生物量大大减少。通常，修剪的植物的花序较少，尽管所有植物中的花序总数很小。修剪导致容器工厂中质量较低的工厂形式。物种内的物种和种子来源对修剪的反应相似。根据这项研究收集的数据，第一年应修剪新种植的草地甜菜和尖顶灌木以取得良好的形态。尽管有时在容器中生长有时会徒长，但这些物种不应在春季生长之前修剪，否则将无法获得最大的生长和良好的形态。

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