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As what he said, they are weeds in pond and they are not so hard to grow. Check this link https://hubpages.com/art/florist-94579
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Hard to what? Water them. Most of them are weeds in a pond. ASk again. More info please.
i do not think they are hard to grow. actually, they propagate fast that they are a problem in our country. check this link...https://hubpages.com/business/Cashing-in-on-Water-
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