| | Re: Diana Walstad - pond
I experiment with aquarium plants in little ponds in my back yard every summer. The plants are in pots because I have tropical fish in some of them, and need to be able to clean and drain the ponds in the fall.
I say "pots', but actually the best results come when I plant in shallow trays about 3" deep. I put 1" to 1.5" of soil on the bottom, then top with pea gravel or coarse sand. This is a deliberate immitation of Walstad's method for aquaria.
Even large plants like water lilies do well when planted like this, if the koi don't dig them up. The koi out grew even my largest pond, so they were given to people with larger ponds. Now my largest fish are goldfish, and they are not as hard on plants.