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What you need:
  • Water plant basket or pot
  • Soil-less water plant mix
  • Pruning shears
  • Washed gravel
This marginal is a Siberian Iris. Before being placed in a water garden it will need to be repotted into a suitable container. First, trim off any dead or dying foliage.
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Next, trim the roots if necessary. This will make it much easier to remove the plant from its pot.
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The amount of roots that were growing out of the bottom of the pot indicated that this plant will benefit from division. Irises are quite easy to divide. Simply break the plant apart with your hands and remove excess soil from the root ball.
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Use a planting basket lined with burlap or a fine mesh pot specifically designed for water plants. Place a handful of the planting mix in the bottom of the pot. Position the plant in the center of the pot
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Fill the pot the rest of the way up with the planting mix. Although the plant was originally planted in soil, for this demonstration a commercial water plant mix made of ceramic pellets is being used. There are benefits to using a soil-free mix: they will not foul the water; no organic material is present. Introducing organic material or fertilizer that may be present in the soil to your water garden will encourage the growth of algae.
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Top dress the pot with washed gravel or grit. Place the plant in your water garden and it's finished.