The jar was nice – but it wasn’t particularly aesthetically pleasing. It was a jar fer cryin’ out loud, with bands of gunk on the outside where the label was glued to it. Not really the kind of thing you wanted to see on your desk or windowsill. As it happened, while poking around in the kitchen cabinets, I found an old wine carafe (from way back when Almaden Vineyards was selling wine in lidded carafes, for some reason) that had managed to survive in there for decades.

“This would make a much better ‘Pond in a Jar’”, I thought. “It’s larger, the outside is cleaner, and is much nicer to look at.” All I had to do was go back to the pond, get another eight ounces or so of water and bottom sediment, and carefully transfer everything into the carafe.

That was done two weeks ago.

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Well, it seems that the plant I thought was Elodea is actually Hornwort (Ceratophyllum demersum), commonly known as “Coon’s Tail” because of its appearance.

A tip of the cap to the hobbyists at Aquatic Plant Central for helping with the I.D.

The darn thing grows really well; in the wild it’s eaten by fish and ducks. But in contained environments, it can grow to the point where it crowds out other plants – unless you trim it regularly. Well, so much for a maintenance-free jar.

Since trimming it will take nutrients out of the jar, I’m a bit worried. I don’t want to have to worry about resource depletion. Maybe I’ll save the trimmings, dry them out, burn them, and put the ashes back in. Or, since I found an old wine carafe (with lid!) that has a much greater capacity than the jar, maybe I’ll just get more pond muck and water (and critters, hopefully) and dump everything into the carafe.

By the way, I did see three diving beetles moving around yesterday. Seems they are most active in the evenings. There are also quite a few snails of differing sizes.

Not too long ago, I came across this article about a biologist who happened to scoop up some pond water in a jar, just because. Looking at drops of it in her microscope, she was surprised to see a specimen of a rare and unusual protozoa – one that just might turn out to be a new species.

My mind went back decades to my own youth, when I had my own “pond in a jar” for a while. I don’t remember what motivated me to make one, but I enjoyed watching water fleas swimming, a hydra anchored to the side of the jar, and even a little freshwater clam doing its thing in the muck at the bottom.

I thought, “There’s a pond near me with a shallow area at one spot, and a good amount of plant life in it. I’ve jot the jar, why not make another one?” Continue reading →