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Table V-4.5.2(21) Maintenance Standards - Bioretention Facilities <br /> (continued) <br /> Recommended Fre- Condition <br /> uenc when Main- <br /> Maintenance q y a Action Needed (Pro- <br /> tenance is <br /> Component cedures) <br /> Routine Main-Needed Stand- ) <br /> tenance ards) <br /> plants <br /> Flowering A Dead or spent Remove spent flowers <br /> plants flowers present (deadhead) <br /> Cut back dying or dead <br /> Perennials Fall Spent plants and fallen foliage and <br /> stems <br /> Hand rake sedges and <br /> rushes with a small rake <br /> or fingers to remove dead <br /> Emergent Vegetation corn-foliage before new growth <br /> vegetation Spring promises con- emerges in spring or <br /> veyance earlier only if the foliage is <br /> blocking water flow <br /> (sedges and rushes do not <br /> respond well to pruning) <br /> . Leave dry foliage for <br /> winter interest <br /> . Hand rake with a <br /> Dead material small rake or fingers <br /> from previous to remove dead <br /> Ornamental Winter and year's growing foliage back to <br /> grasses (per- within several <br /> ennial Spring cycle or dead <br /> collapsed inches from the soil <br /> foliage before new growth <br /> emerges in spring or <br /> earlier if the foliage <br /> collapses and is <br /> blocking water flow <br /> • Hand rake with a <br /> Ornamental Dead growth small rake or fingers <br /> grasses (ever- Fall and to remove dead <br /> present in <br /> green) Spring spring growth before new <br /> growth emerges in <br /> spring <br /> 2014 Stormwater Management Manual for Western Washington <br /> Volume V- Chapter 4 -Page 877 <br />