Photo by Melody

PlantFiles: Yard Rush
Juncus tenuis

Family: Juncaceae
Genus: Juncus (JUN-kus) (Info)
Species: tenuis (TEN-yoo-iss) (Info)

2 vendors have this plant for sale.

Ornamental Grasses and Bamboo
Ponds and Aquatics

6-12 in. (15-30 cm)
12-18 in. (30-45 cm)
18-24 in. (45-60 cm)

6-9 in. (15-22 cm)

USDA Zone 2a: to -45.5 C (-50 F)
USDA Zone 2b: to -42.7 C (-45 F)
USDA Zone 3a: to -39.9 C (-40 F)
USDA Zone 3b: to -37.2 C (-35 F)
USDA Zone 4a: to -34.4 C (-30 F)
USDA Zone 4b: to -31.6 C (-25 F)
USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)
USDA Zone 9a: to -6.6 C (20 F)
USDA Zone 9b: to -3.8 C (25 F)

Sun Exposure:
Full Sun
Sun to Partial Shade

Unknown - Tell us

Bloom Color:

Bloom Time:
Late Spring/Early Summer
Mid Summer

Grown for foliage

Other details:
May be a noxious weed or invasive
Requires consistently moist soil; do not let dry out between waterings
Very high moisture needs; suitable for bogs and water gardens

Soil pH requirements:
Unknown - Tell us

Patent Information:

Propagation Methods:
By dividing the rootball
From seed; direct sow outdoors in fall
From seed; winter sow in vented containers, coldframe or unheated greenhouse

Seed Collecting:
Bag seedheads to capture ripening seed
Collect seedhead/pod when flowers fade; allow to dry

Click thumbnail
to view:

By melody
Thumbnail #1 of Juncus tenuis by melody

By Malus2006
Thumbnail #2 of Juncus tenuis by Malus2006

By natureguyfrog
Thumbnail #3 of Juncus tenuis by natureguyfrog

By natureguyfrog
Thumbnail #4 of Juncus tenuis by natureguyfrog


1 positive
1 neutral
No negatives

Gardeners' Notes:

Positive natureguyfrog On May 5, 2013, natureguyfrog from San Diego, CA wrote:

These are corrections that I have submitted to "Admin". I hope that some of the essential information listed above can be changed and there is also additional info here that may be of use to other gardeners:

May 5, 2013
On I found an error. The error that I found is:
Juncus tenuis:
Height: 7" to 24" (it is doubtful that is ever more than 24")

Bloom Color: inconspicuous/none (the yellow-green or chartreuse is descriptive for the Cyperus species in the picture not for J. tenuis)

Juncus tenuis unlike many Cyperus species is NOT a noxious weed in most if not all situations. Even in the wild it is rarely seen in very dense groups.

It is less common as a permanant pond or marsh plant. It is most commonly found in moist woodland margins, grassy meadows with heavy soil especially those with vernal pools/seasonal marsh. Clay soil and compacted soils ie. along paths.

In garden likes heavy soils that do not dry out completely. When dry, goes dormant. Not likely to thrive well with permanant "wet feet".

PLEASE make the appropriate corrections as much of the original description was for the Cyperus species shown in the first picture.

The second picture is somewhat suspect as well since the leaves are a little longer than is typical for a plant in the conditions of this picture. This could be any of a number of different genus/species!


Neutral melody On Jan 3, 2005, melody from Benton, KY (Zone 7a) wrote:

A common site in boggy ,low lying areas. The strong stems make it difficult to cut with an ordinary weed whacker. It tends to stay in the wetter areas, so isn't really invasive.


This plant has been said to grow in the following regions:

Benton, Kentucky
Georgetown, Kentucky
Louisville, Kentucky
Minneapolis, Minnesota
Frenchtown, New Jersey

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