Iris pseudacorus aka Yellow Flag Yellow Iris Water Flag Dragon Flower Paleyellow Iris Tolerance Sun Tolerance Medium High Water Tolerance Medium High Stats Perennial Herb Height 36.00 in 60.00 in Spread 24.00 in 36.00 in Zone Range 5A 8B Ph Range 6.00 8.00 Propagation Propagation Method Division Sowing Bloom Month April May June July Bloom Size 2.50 in 4.00 in Flower Color Yellow Fruiting Month September October November Environment Pests/Diseases Leaf Blotch Bacterial Infection Fungal Infection Sawflies