Acorus gramineus

Common name: grassy-leaved sweet flag
Type:
Herbaceous perennial
USDA hardiness zones:
6-9

Acorus gramineus is commonly called grassy-leaved sweet flag. It is native to wetland areas of China, Japan, Korea, India, Thailand, Myanmar and the Philippines. It is a semi-evergreen, marginal aquatic perennial that features a grass-like tuft of narrow, linear leaf blades (1/4ì wide) that fan outward to 6-12î tall. Tiny, insignificant, yellow-green flowers bloom from spring to early summer on lateral, sedge-like flower spikes (spadixes to 2-4\ long). Flowers give way to very tiny, reddish, fleshy berries. Tufts will slowly spread over time by rhizomes to form a dense ground cover. Plants t... more »

  • Full sun to part shade
  • Medium to wet
  • Low

Easily grown in average, medium to wet soils in full sun to part shade. Plants perform well in both boggy conditions (including shallow standing water to 3-4î deep) and consistently moist garden soils. Never allow soils to dry out. Scorched leaf tips and withering leaves are often the first signs of drying soils. In water gardens, plants are typically planted in containers with water covering the crowns or in wet soils at the waterÃs edge. Plants appreciate some relief from hot summer sun (e.g., afternoon shade or filtered sun) when grown in hot summer climates such as the St. Louis area. Plants will slowly naturalize by spreading rhizomes, but are not considered to be invasive. If grown in containers sunk below the water surface, plants will not spread. Plants are not considered to be reliably winter hardy in the northern parts of USDA Zone 5.

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