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Q: Hi! I am in South Florida, zone 9/10. Our pond levels increase and decrease with the rainy season. Would this plant be attached in soil or does it float? Would it live through a 2' pond level increase? And is this an ok time to start them here?
A: Mare's Tail can float, but similar to parrot feather it is not defined as a floating plant. It grows best potted, but will survive if it is submerged as you described. If allowed to float, Mare's Tail will lay flat floating on top of the water surface and then the tip will eventually rise up out of the water about 3". This is how I grew several plants last summer.
Although Mare's Tail is cold hardy zone 7 it will also grow in hotter zones, such as 9 and 10. In hot climate zones, it is good to start this plant in late fall and in the wintertime. Also, keep in mind that caterpillars love to munch on its leaves, so you will need to watch out for that!