The Sagittaria sagittifolia (Arrowhead) are no longer looking good enough to send out by mail order.
We still have them on the Nursery but they are like a daffodil. Once the plant has flowered the foliage dies back to help bulk up next years’ bulbs.
If your Sagittaria sagittifolia leaves have gone over and look yellow - don't panic. There should be 3 or more bulbils in or near the basket that will give you next years show of arrowhead leaf and flowers. They will be growing on the ends of long stem like tendrils (called turions). They will continue to grow larger as long as they are attached to the parent plant.
Locate the bulbs when they have fallen away from the joining stem/turion and push these loose bulbils back into the mud of the basket. You will then know where they will grow from next year.
Often the parent basket will be empty after a year or two if you do not replace the bulbils. The Sagittaria plant will then appear growing in another basket nearby.