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→Design
===Design===
===Design===
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<h4>Planting Medium</h4>
<h4>Planting Medium</h4>
<p>In many proprietary systems the default option for planting medium will be a granular material with very low organic matter content. However, many companies can arrange for a high organic content alternative to be substituted if requested. </p>
<p>In many proprietary systems the default option for planting medium will be a granular material with very low organic matter content. However, many companies can arrange for a high organic content alternative to be substituted if requested. </p>
<h4>Planting</h4>
<h4>Planting</h4>
<p>The choice of vegetation on an extensive green roof is insigificant in stormwater management compared to the choice of planting medium or the provision of irrigation. The vegetation should be selected to be resilient to both very wet and very dry periods. <em>Sedum</em> species are the most common choice, demonstrating excellent longevity in systems without irrigation. </p>
<p>The choice of vegetation on an extensive green roof is insignificant in stormwater management compared to the choice of planting medium or the provision of irrigation. The vegetation should be selected to be resilient to both very wet and very dry periods. <em>Sedum</em> species are the most common choice, demonstrating excellent longevity in systems without irrigation. </p>
<p> However, some projects expect the low growing <em>Sedum</em> to remain in graphic designs according to species and flower color. This is not a realistic expectation without huge maintenance costs. Instead project stakeholders should be prepared early in the design process to embrace the green roof as a living and evolving ecosystem. </p>
<p> However, some projects expect the low growing <em>Sedum</em> to remain in graphic designs according to species and flower color. This is not a realistic expectation without huge maintenance costs. Instead project stakeholders should be prepared early in the design process to embrace the green roof as a living and evolving ecosystem. </p>
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PondRd1.jpg
PondRd2.jpg| Very light maintenance of this prairie style green roof has permitted a stand of Mullein to develop.
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