Biofilters with indigenous South African plants, such as palmiet, mat sedge, soft rush, cobra lily and vleibiesie, are significantly more efficient than unvegetated soils in removing nutrients and metals pollutants from urban stormwater, Stellenbosch University (SU) researchers say. The team investigated the individual efficiencies of nine indigenous plant species and unvegetated soil exposed to varying concentrations, or loads, of nutrients and metals based on published figures of stormwater runoff pollution concentrations and loads. Plants that could mature rapidly during the experimental period and could tolerate inundation and periods of drought were used in the study.
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