Irises UK’s largest selection of Irises Key Benefits :Keep water ClearExcellent summer flowersWide range of coloursEasy to grow Iris FAQs Can any Iris grow in a pond? It’s a common misconception that All Iris can thrive in fully submerged in water, Only I.Laevigata, I.Lousiana & I. Pseudacorous varieties can. Other species are prefer moist soil. What is the best Iris for small Ponds ? I. Laevigata & I. Lousiana What is the best Iris for Lakes? I. Pseudacorous 5. Is Iris Poisonous? Yes all parts of the plant are poisonous, especially the rhizome which can cause problems if eaten. Wash your hands after handling the plant. FREE DELIVERY ON ALL ORDERS OVER £50