This picture, taken in July 2001, shows a part of the planting area in the top pond one month after planting

Here there is  myriophyllum on the right, calla palustris behind it and eriophorum angustifolium on the left.

The calla palustris died down almost immediately, then grew and spread rapidly.  You will see that the eriophorum angustifolium has already sent out new growth.