http://www.northcreeknurseries.com/_ccLib/image/plants/DETA-374.jpg

Juncus effusus – common rush – Juncaceae

Notes/Sites: Zone 4-9. Found in North America, New Zealand and Australia. 2-4 feet tall and wide. Blooms in June/August. Full sun. Moist to wet soils or 4 ” standing water. Clumps are slow to establish but creep by rhizomes afterwards. Best grown in containers or slabs to stop spreading. Cut back old foliage in early spring. Good for rain gardens, damp areas, naturalized areas or water.

Aesthetic/Notes: This is pretty commonly seen in rain gardens – especially the emergent layer. I think it is most appropriate there where it can reach constant water. The form is stiff and sculptural, adding structural/textural interest.

https://www.provenwinners.com/sites/provenwinners.com/files/imagecache/max_width/ifa_upload/64218.jpg