Juncus effusus This commonly occurring, round stemmed rush makes a great addition to wet sites. Blooms in summer. Plant Details Habitat: Riparian Forests Bottomland Forests Shrub Swamp Shallow Marsh Wet Prairie Tolerates a wide range of soils. Deer resistant. Mature Height: 2-6 ft. Shade Preference: Soil Tolerance: moist, humus-rich soil Special Uses: Can be useful around bioswales and ornamental ponds.