Garden Centre › Carex Flag. Green Form Image 1 of 1 Carex Flag. Green Form $8.95 Sold Out Carex 'Flag' (Green Form) - Versatile sedge for mass planting or rain gardens; low care. Mature size: 40-60 cm x 50-70 cm. Sold Out Added! Carex 'Flag' (Green Form) - Versatile sedge for mass planting or rain gardens; low care. Mature size: 40-60 cm x 50-70 cm. You Might Also Like Quick View Hebe Wiri Mist $9.95 Quick View Kahikatea from $19.95 Quick View Dietes Grandiflora $9.95 Quick View Kowhai (Sophora microphylla) from $9.95 Quick View Muehlenbeckia astonii $9.95