Answer: Horsetails grow well near water and can look very attractive. The plants are hardy to <a href="http://www.garden.org/regional/images/maps/usdamaplg.gif"target="new">USDA Zone 5</a>, or approximately -20<font size="-3"><sup>o</sup></font>F.
On the other hand, all horsetails are considered invasive plants. Don't ever plant them in or near ponds with natural bottoms. On the other hand, if it's spreading roots are restrained by a container it should be fine.
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