Click here for more info about Japanese sweet flag. Small greenish-yellow flowers appear on spikes in spring and early summer, followed by red berries. Divide Japanese sweet flag grass in spring every three or four years. Japanese sweet flag (Acorus gramineus) is a striking little aquatic plant that tops out at about 12 inches. Japanese sweet flag is a striking aquatic plant that tops out at about 12 inches. 24 - 36". Miniature greenish-yellow blooms appear on spikes in spring and early summer, followed by tiny red berries. However, full sun is best if the soil is extremely boggy. Sweet flag is hardy to USDA plant hardiness zones 6 through 9, although some Acorus sweet flag info indicates the plant is tough enough for zones 5 through 11. The tallest Japanese sweet flag grasses top out at about 39 inches in height, while the smallest dwarf cultivars can be as short as 3 inches. Sweet flag plant benefits from division in spring every three or four years. The bright color is good for brightening shady areas. This is one of the rare garden plants that has no serious insect or disease problems. Protection from hot afternoon sun can be beneficial in very hot weather. Learn tips for creating your most beautiful (and bountiful) garden ever. It is not important that the soil is well-drained. This plant is a good choice for stabilizing damp areas prone to erosion, such as the banks along creeks or landscape ponds. https://en.wikipedia.org/w/index.php?title=Acorus_gramineus&oldid=960250085, Plants used in traditional Chinese medicine, Creative Commons Attribution-ShareAlike License, This page was last edited on 1 June 2020, at 23:07. Leaf scorch is an indication of too little water. The term flag derives from the Middle English word flagge, meaning "reed.". Native to hot, humid climates of Asia, Japanese sweet flag grass can tolerate the heat and humidity in any U.S. region; dryness is another matter. Read more articles about Sweet Flag Grass. In Japan during the Heian period, leaves of the plant were gathered for the Sweet Flag Festival on the fifth day of the fifth month. Leaves can brown at the edges in cold winter weather. Introducing "One Thing": A New Video Series, The Spruce Gardening & Plant Care Review Board, The Spruce Renovations and Repair Review Board, Japanese sweet flag grass, sweet flag, calamus, 3 inches to 3 feet tall and 6 inches to 2 feet wide. Sign up for our newsletter. Find more gardening information on Gardening Know How: Keep up to date with all that's happening in and around the garden. This is an aquatic plant, so constant or near-constant contact with water is essential. It can be propagated by dividing the fleshy underwater rhizome and planting the base in shallow water. The leaves are typically light green to golden-yellow in color and can help brighten dim garden areas. It can grow fully or partially submerged, or in very moist soil, but it will usually only flower when at least partially submerged. Although slow-growing, it can be somewhat invasive in ideal conditions. It is a good choice for stabilizing the soil in damp, erosion-prone soil. To grow sweet flag in a pond or other standing water, place the plant in a container and set it in water less than 4 inches deep. This water-loving plant also likes a fair amount of sun. The plant usually grows in wetlands and shallow water. Acorus gramineus, commonly known as Japanese sweet flag, Japanese rush, grassy-leaved sweet flag, and grass-leaf sweet flag, is a botanical species belonging to the genus Acorus, native to Japan, Korea, and eastern Asia. Japanese sweet flag grass is a nearly effortless landscape plant to grow. It doesn’t take much effort when growing sweet flag grass. The plant also goes by the common names of sweet flag and calamus. Var. It grows well in full to part shade, but more sun usually means that the soil needs more water to prevent it from drying out. 'Variegatus' is variegated with cream stripes. The "sweet" label comes from the pleasant, spicy aroma the leaves produce when crushed. The rhizomes are sweetly scented as are the leaves when crushed. It can be also grown in containers within landscape ponds or other water features. Japanese sweet flag grass (Acorus spp.) Native to Japan and China, Acorus generally grows in USDA hardiness zones 6 to 9, with a few cultivars appropriate as far north as zones 4 and as far south as zone 11.
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