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 I want to make a little barrel pond someday, too. One I could put on the porch. I don't know what I would keep in it, probably end up being a giant cat water bowl. 
 There are some lovely varieties of tiny water lilies, which Iā€™d like to try, and watercress is supposedly very easy and a nice tasty salad crop. 

(The question of how I would keep my hypothetical future ducks out of it is an interesting one.) 
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 @Flick šŸ‡¬šŸ‡§ @38bc42fd arrowhead and cape pondweed are edible and good in even tiny ponds 
 Ta, added then to my plant list.