Plants with non-woody stems above ground. The above-ground growth in herbaceous plants dies back in winter months, but typically underground plant parts (roots, bulbs, etc.) survive.
The LID Certification System encourages LID practices in development projects. The goal is to catch every drop of water from our built environment before it reaches a stream or lake, and reduce the non-point source pollutants to a level that is in balance with the natural systems of the waterbody.