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Three-Square Rush

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Botanical Name:
Scirpus Americanus

Hardiness Zone:
Zone 3-9

Mature Height:
1-2 ft

Mature Width:
1 ft

Growth Per Year:
1-2 ft

Light Requirement:
full sun

Soil Requirement:
moist to very dry

Status: In Stock
Here's how your plants will look on arrival. All plants are dormant with no leaves or foliage.

Three-Square Rush – Carex Trisperma


3-square-bul-rush.jpg   3-square-bul-rush2.jpg



Three Square Rush – Scirpus Americanus


Three Square Rush is a warm-season grass that flowers from early June through September. The sturdy stems can grow to between three to four feet with loose clusters of small spike shaped protrusions. Groups are found one to two inches down from the top of the stalk, and stems have a triangular cross-section shape. Each plant has very few leaves that are not immediately apparent at first glance. Leaves have a similar look to the stem and remain close to the stalk. Spiked blossoms range in color from a reddish brown to a more yellowish hue and will develop black or gray achenes as they mature. As a perennial member of the Bulrush family, the Three Square Rush is an excellent stabilizer for river banks and the edge of ponds. They are also found along marshy areas, shorelines, and any other spot with mucky, sandy soil. They have a moderate salt tolerance and are drought resistant. These plants grow best in zones 2 – 9. Landscape options include immersed locations. They do well in up to six inches of water, but they have been known to thrive in as much as 17 inches. Submerged portions help create a beautiful habitat for macro and micro invertebrates that can be used to feed fish and wildlife such as amphibians, ducks, and reptiles. Ducks, muskrats, and geese feed off of the seeds. These grassy plants do best when grown in full sun, and although they prefer a wetland setting, they do tolerate organic, fine-textured soils as well as clay. Gardeners love this species for its medium growth rate that makes it ideal in areas of moderate erosion. It adds interest with its unusual blossoms and appearance that mimics ornamental grasses while helping hold the dirt in place.


Three square rush is a perennial. This plant will grow back year after year. The plant usually grows about 2 to 3 feet a year. This plant will grow well in a wet-mesic type of environment.