Common Rush

Juncus effusus (Juncaceae) is a cosmopolitan rush native to wet climates across Eurasia, North America, Australia, and New Zealand. It forms large clumps 2 to 4 feet tall, spreading by rhizomes and self-seeding. The plant produces no true leaves; instead, smooth cylindrical stems filled with light pith serve as the photosynthetic organs. Yellowish inflorescences emerge near the stem tips from midsummer to early fall.

Common rush requires full sun and consistently moist soil, tolerating bog conditions and standing water. It adapts to a pH range of 6.0 to 8.0 and works well in rain gardens, bioswales, and container water features. In warm zones it remains evergreen; in cold climates the foliage yellows and browns with frost. The cultivar 'Spiralis' (corkscrew rush) has distinctively spiraled stems that provide strong textural interest. Historically, the pith was used for tallow candles and the stems for weaving mats and baskets. Hardy across Zones 1a to 11a.