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===Plants===
Plantings on the filter bed should be dense to help maintain surface infiltration and improve sediment settling and retention of dissolved contaminants. It is recommended that perennial forbs and grasses are planted 0.5 m on center, and no more than 0.6 m on center.
Planting plans should feature a mixture of deeply rooting perennials adapted to both wet and dry conditions and local climate. Road salt tolerance should be considered if facility will receive pavement runoff. Native plants are often the most hearty, adaptable, salt tolerant and deeply rooted options for bioretention planting. Invasive plants should not be planted in bioretention areas.
===Plant Selection===
===Plant Selection===
The nature of bioretention cells is to attenuate stormwater from rainfall events of varying intensities. For this reason, the vegetation used must be suitable for the varying moisture conditions and is often categorized into three zones related to the grading of the feature.
The nature of bioretention cells is to attenuate stormwater from rainfall events of varying intensities. For this reason, the vegetation used must be suitable for the varying moisture conditions and is often categorized into three zones related to the grading of the feature.