Yellow Flag Iris - Hardy Bog
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  • Details
  • Plant Info
  • Hardy Bog Plant
  • Blooms May to July
  • Increases Natural Filtration

Enjoy canary yellow spring flowers above 2' to 3' vertical green foliage. The Yellow Flag Iris has a robust stalk, and the plant has a long blooming season. It is a very hardy plant and a strong grower. The plant is the only yellow iris in the United States.

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Bog Plant - Yellow Flag Iris
Yellow Flag Iris
Plant Type Bog
Hardiness Zones 3 to 12
Growing Light Full Sun To Partial Shade
Flower Color Yellow
Bloom Time May - June
Plant Size Vertical to 36"
Also Known As Iris pseudacorus, Yellow Flag

Mail Order: What To Expect

Plants you receive by mail need time to adjust. Yellow Flag Iris will arrive in a 2" Pot (roots with some foliage). Upon arrival, they may not appear lush but given time & proper care, they will flourish

Planting Instructions

The rhizome (root) of your plant needs to be positioned in the aquatic planting media so that the cut end tuber is against the side of the planting container, not in the middle. This gives the root as much room as possible to spread across the planting container. Avoid using bagged potting mix and other lightweight soils because they will float and continually cloud pond water. Place planting container on the planting shelf in up to 6" of water depth.


Regular fertilization of your Iris will keep your iris blooming and growing well all season long. CrystalClear® Thrive™ Aquatic Plant Fertilizer or TetraPond® LilyGro™ Aquatic Plant Food or Laguna Plant Grow Fertilizer Spikes can be pushed into the soil at planting time and from April through August, following all manufacturers' recommendation for fertilizer application rates.

Plant Maintenance

For best results, trim or prune as leaves and flowers begin to turn yellow or brown, remove them completely, discarding them to keep as much excess organic material out of water-body as possible.

Winter Care

All leaves and stems will begin to die off as winter arrives. If planted directly into a bog area, plants should be left alone after trimming any dead foliage to 1 to 2" above the top of the water. Plants that are on plant-shelves, in planting containers, should be trimmed to 1 to 2" and then gently lowered into the ponds deeper water. All plants submerged before winter must be brought back up as soon as the ice has permanently thawed, and before any plant growth occurs. In Zones 6 and warmer, most pond plants can tolerate being left in place without moving them at all.


Yellow Iris can extremely invasive in some states. Some states restrict these plants from being shipped. Never release these plants in public lakes or waterways in any state.