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PlantFiles: Corkscrew Rush
Juncus effusus 'Unicorn'

Family: Juncaceae
Genus: Juncus (JUN-kus) (Info)
Species: effusus (eff-YOO-sus) (Info)
Cultivar: Unicorn

2 vendors have this plant for sale.

11 members have or want this plant for trade.

Ponds and Aquatics

18-24 in. (45-60 cm)

24-36 in. (60-90 cm)

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)
USDA Zone 10a: to -1.1 C (30 F)
USDA Zone 10b: to 1.7 C (35 F)

Sun Exposure:
Full Sun
Sun to Partial Shade
Light Shade

Unknown - Tell us

Bloom Color:
Chartreuse (Yellow-Green)

Bloom Time:
Late Summer/Early Fall

Grown for foliage

Other details:
Unknown - Tell us

Soil pH requirements:
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)

Patent Information:
Unknown - Tell us

Propagation Methods:
By dividing the rootball

Seed Collecting:
Unknown - Tell us

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By Zanymuse
Thumbnail #1 of Juncus effusus by Zanymuse

By Zanymuse
Thumbnail #2 of Juncus effusus by Zanymuse

By smarte42
Thumbnail #3 of Juncus effusus by smarte42


6 positives
1 neutral
No negatives

Gardeners' Notes:

Positive httpmom On Aug 16, 2013, httpmom from Livermore, CA (Zone 9b) wrote:

I purchased three of these (I always buy plants in 3s or 5s) in 6 pots 3 years ago. They were all the rage 6-7 years ago, at The San Francisco Garden show. So beautiful and architecturally arresting in the garden. I planted two in direct sun as was recommended on the plant tag and one in bright shade. The full sun ones are long gone, but the bright shade plant is about 3x3 and looking as spectacular and ethereal as it gets. I live in CA Zone 9b. Hope I can find a few more. Just love the little thing.

Neutral Oberon46 On Nov 1, 2008, Oberon46 from (Mary) Anchorage, AK (Zone 4b) wrote:

I planted two of these in my pond in mesh baskets and sunk them to three inches over the soil line. They did fine all summer and for winter I sunk them into the water, one totally and one part way. I am not sure how they will do with our -20 weather. The ice is already (Nov 1) 5-8" thick. It will be March or April before I can see them or my fish again.

Positive sherpo1 On Jun 6, 2008, sherpo1 from Maryville, TN wrote:

Helpful tip for those without wet growing conditions---
I've found a microclimate that provides great growing conditions needed by Corkscrew Rush: about 18" away from my air conditioning / heating unit! A pvc pipe directs the water from the ac unit to the plant keeping it moist and healthy all season without any additional watering.
An added bonus:
in the winter, the Rush continues to thrive (even spread) warmed by the heat given off from the gas exhaust of the unit!

Positive EAPierce On Feb 24, 2006, EAPierce from Idaho Falls, ID (Zone 5a) wrote:

A good local garden center here in SE Idaho carries this and classifies it as both a perennial grass and an aquatic, which is accurate. While it thrives best in wet, marshy conditions and standing water, it also lives and grows perennially in cold climates with alkaline, heavy soil, and tolerates drought. I planted a gallon-sized specimen last year in a semi-shady location, and it did just fine and even spread at a nice, easy pace. I also noticed that it stayed green underneath the snowdrifts this winter. I'm sure it's a great aquatic plant, but those with rock gardens might want to consider it as a nice accent. It's a truly unique grass- verra verra pretty stuff.

Positive crimsontsavo On Jul 7, 2004, crimsontsavo from Crossville, TN (Zone 7a) wrote:

Yet another plant you must have. It's very interesting with it's curly foliage. Ours is growing in our pond.

Positive sfanemone On Jun 10, 2003, sfanemone from San Francisco, CA wrote:

I am growing this in a container on my deck in light shade. It's doing well, despite being an aquatic. [I didn't know that when I got it.]

Positive Zanymuse On Jun 10, 2003, Zanymuse from Scotia, CA (Zone 9b) wrote:

This plant adds visual interest to the pond with its contrasting texture and unique form.


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

Fortuna, California
Livermore, California
San Francisco, California
Fountain, Florida
Marietta, Georgia
Idaho Falls, Idaho
Byhalia, Mississippi
Utica, New York
Youngstown, Ohio
Wilkes Barre, Pennsylvania
Maryville, Tennessee
Lexington, Virginia
Concrete, Washington
Edmonds, Washington
La Conner, Washington

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