Plant this rush in full sun to light shade in moist soil, a pond to a depth of 4 inches, or in areas that gets only occasional irrigation. It is hardy to below 15 degrees F - how much so we do not know. This plant seeds about in the garden but not in great quantities so it really does not seem pesky. Besides the nice foliage the brown flowers are attractive and useful in small flower arrangements.

We consider this plant a Carman Nursery introduction. The story as we have it from John Greenlee is that Ed Carman was delivering plants to a garden in Woodside, California that was being worked on by a Japanese master garden designer and stonemason, who noted that he always included this elegant rush in his gardens and gave a plant to Ed - John Greenlee purchased a plant at Carman's Nursery in the mid 1980s and subsequently named it 'Carman's Japan'. We received this plant from John Greenlee in 1987 and have grown it in our nursery ever since.

This cultivar was listed as a selection of Juncus effusus by Rick Darke in his book The Color Encyclopedia of Ornamental Grasses, where he calls the plant 'Carman's Japanese'. Juncus effusus has a wide distribution and is considered native to Europe, Asia, Africa, Madagascar, North America, and South America and naturalized in Australia, New Zealand and South Africa. The name for the genus comes from the Latin word 'iuncus' which was the ancient word for Rushes and came from the word 'iungere' meaning "to join" and was in reference to the use of rushes for cordage and tying. Though we are not sure this plant belongs with this species. The specific epithet 'effusus' comes from modern Latin word meaning "to spread loosely' in reference to its open growth habit. 

This information about Juncus 'Carman's Japan' displayed is based on research conducted in our horticultural library and from reliable online resources. We also will relate observations made about it as it grows in our nursery gardens and other gardens we have visited, as well how the crops have performed in containers in our nursery field. We will also incorporate comments that we receive from others and we welcome hearing from anyone with additional information, particularly if they can share any cultural information that would aid others in growing it.