250 SWEET FLAG WETLAND POND GRASS Acorus Calamus Ornamental Seeds BLOOM TIME: Summer HARDINESS ZONE: 4 - 9 PLANT HEIGHT: 24 - 60" . . . PLANT SPACING: 24 - 36" LIGHT REQUIREMENTS: Sun - Part Shade . . . SOIL / WATER: Wet Sweet Flag Grass is fragrant and enjoys wetland settings and ponds. The dried grass-like leaves are popular for weaving into baskets or other crafts.