In article , MarkA MarkA.1w2o7y@garden
banter.co.uk writes

I want to construct a mini wildlife pond in a container approximately
400mm x 600mm x 300mm depth, sunk into the ground. Which (native)
oxygenating plants would be best in this small space, and should they
be planted in a substrate at the bottom of the container or in pots?

If it's to be wildlife, most important thing will be to have some sort
of ramp up to the edge so amphibious wildlife can get out.

--
Kay
"Do not insult the crocodile until you have crossed the river"