The care secret that transformed my Blue Flag Iris

I'd had Blue Flag Iris for about eight months with acceptable but unremarkable results. Then I started really paying attention to dividing overcrowded plants every two or three years in spring and the difference over the next two months was dramatic.

cooling visual effect and microclimate benefit in summer became much more pronounced. The plant in an indoor water feature with appropriate species now looks like a completely different specimen. first leaf pads emerging at the water surface in spring confirmed that I'd finally unlocked what this plant can do. blanketweed algae competing for nutrients in established ponds has been less of a problem since I got the overall conditions right. If your Blue Flag Iris is underwhelming, look at dividing overcrowded plants every two or three years in spring first.