Powder witches can be planted with granular soil, which is more conducive to the permeability of roots, but it should be noted that the proportion of granular soil should not exceed 70%, and powder witches can be exposed in the growing season, which not only ensures sufficient sunshine. Tortoise shell perennial aquatic herb, with transverse rhizome, stout, swollen internodes, multiple longitudinal airways inside and hairy adventitious roots below.