What kind of soil do I use when re-potting Water Iris? Can I buy the soil at The Home Depot or Lowes Garden department? I re-potted Iris last year using "Potting Soil" but every one of them died. I also put Iris clumps that I divided tucked around some boulders and rocks around the pond and they all lived.
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It is less about the soil, and more about keeping the pot and soil completely or close to completely wet at all times. This can pose a problem for container plants, so Peroxide will become your best ally in preventing infection to your plants. This article will help: https://www.gardeningknowhow.com/ornamental/bulbs/iris/water-iris-plant-care.htm