How to Grow Mare's Tail

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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!

How to Grow Water Lettuce in Winter

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Water lettuce requires plenty of sunshine...
But in the wintertime, water lettuce has special needs. I presently keep my water lettuce and my water hyacinth in shallow plastic containers inside a greenhouse protected from frost and freeze.

Growing Water Lettuce Indoors
In cold winter conditions water lettuce can be wintered over indoors in a sunny window. However, it needs warmth and humidity. This can be accomplished with a Water Garden Light Box; such as the one pictured here. This light box was simply made with an aquarium located in a sunny window covered with clear plastic wrap (to keep in the humidity) and with mirrors inserted inside the aquarium to reflect the light. (The mirrors were scrap mirrors I obtained for free from a glass and mirror company.) The mirrors were inserted on the bottom and on the left and right sides of the fish tank. I tried growing water lettuce the following year without mirrors, and the plants did not survive.

Florescent Lighting
A florescent light must be placed on top of the aquarium to create heat and humidity. A grow light can be used to replace the florescent bulb and can be purchased online or at any hydroponics store. .

Growing Water Lettuce Outdoors
In the wintertime, if water lettuce is grown outdoors in a pond, it needs to be protected from freezing temperatures and covered with plastic or a Hoop House. However, it will also need a fan to circulate the air to prevent mold and mildew.

Here are some helpful links about growing water lettuce:
How to Grow Water Lettuce

Build a Water Garden Light Box

Questions?
If you have any questions or comments, please feel free to contact me at gail@pondplantgirl.com