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Ogon Sweet Flag

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Japanese sweet flag grass (Acorus spp.) is a perennial aquatic plant with sword-like leaves that resemble those of iris. It is often used along the borders of landscape ponds and other water features. Despite its common name, Japanese sweet flag grass is not an ornamental grass but instead is a perennial that spreads by underground rhizomes.

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. The plant also goes by the common names of sweet flag and calamus. The term flag derives from the Middle English word flagge, meaning “reed.”
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. The species is slow-growing but often needs to be controlled (usually through division) over time, to prevent excessive spread. The leaves are typically light green to golden-yellow in color and can help brighten dim garden areas. Small greenish-yellow flowers appear on spikes in spring and early summer, followed by red berries. The “sweet” label comes from the pleasant, spicy aroma the leaves produce when crushed.
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