Reference: 1232
Sweet Flag, also known as Calamus or Acorus calamus in Latin, is a perennial herbaceous plant measuring 50 to 120 cm in height. This plant belongs to the Acoraceae family. This hardy, aromatic reed is native to and cultivated in the marshy regions of Northern Asia.
The seeds of the sweet flag are triangular, yellow, rather slender, and measure 4 to 5 millimeters in length.
Its flowering period takes place from the beginning of May until the end of August, producing small yellow spikes.
The root consists of several rhizomes measuring 3 cm in diameter; they are gray and very hard.
This aquatic plant needs soil rich in organic matter and minerals. A mix of equal parts potting soil and sand is recommended. Gravel can also be added to the substrate.
Calamus grows in relatively humid, even marshy, environments. For watering, simply always leave a little water at the bottom of the saucer and refresh it regularly. For outdoor cultivation, grow Sweet Flag in a very wet area, such as the edge of a pond. Never let the roots dry out.
It acclimates to all kinds of light. It prefers sunny situations but also tolerates shaded corners of a water garden.
It grows very well between 15 and 25°C. It is a hardy aquatic plant that easily withstands harsh winters (USDA hardiness zones 3-9).
Sweet Flag can be propagated in two ways: by seed in early spring or by dividing the rhizome at the end of the season.
Acorus is not very susceptible to diseases or pest attacks.
Cut off yellow leaves at the beginning of winter. Remove the inflorescences (flower spikes) at the end of summer.
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