05-15-2013, 05:07 PM
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I keep plants in bottles with soil under a layer of pea gravel on my windowsill and they do great. I use large juice bottles, small jars, anything. They're sealed, I don't fertilize, and I don't change the water. I have a few snails in the largest jar, and they do great.
I think it depends on the type of plants, also. Slow growers may not do so well, they can't use up all the nutrients fast enough. I grow anacharis/elodea, ludwigia, and hornwort in jars just fine.
If you want to grow crypts and the like I'd add a few fast growing stems to prevent algae, and maybe add a small snail.
I also have two one-gallon jars with an amazon sword each, potted water sprite, and a few other plants and the growth is excellent, not even a smidge of algae.