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When installed correctly, pre-planted coconut fiber products can facilitate wetland and riparian revegetation and increase chances of success on challenging sites. Pre-planted coir blankets, for example, use efficient sod-style installation, provide some immediate erosion control, and contain relatively mature herbaceous wetland plants with well developed root systems and high shoot cover. This can greatly accelerate ecological and aesthetic results, reduce weed problems, and allow newly installed vegetation to tolerate less than ideal hydrologic conditions better than individual nursery-grown plants. Pre-planted products are not foolproof, however. Due to their obvious robustness, it is tempting to overestimate what they can tolerate and to neglect important details of planning and execution. As with other wetland and shoreline revegetation techniques, most problems result from failing to match plants with hydrology or failing to provide suitable water levels during initial establishment and for the long-term. Understanding site hydrology and species' environmental requirements is central. Grading design and construction, plant selection, soil specifications, and timing of installation must address hydroperiod carefully; inches or weeks can mean the difference between sufficient water, lethal drying, or excessive flooding, and these consequences depend on soil type and plant species. During installation surface irregularities must be limited to achieve good root-soil contact. If project delays push installation outside the target period for hydrology, supplemental irrigation may be required. Potential herbivory and trampling should be evaluated and barriers installed where needed. Adequate temporary anchoring is required and must match site hydraulic conditions; pre-planted coir is not an instant erosion control system and depends on rooting for effective stabilization. In our oral presentation, we will present case studies illustrating problems as well as successful, well executed projects. |
