You will easily recognize this plant by name. The corkscrew has spiral stems. They will begin to produce brown foliage as the weather gets colder. You can maintain this plant by cutting off dead leaves that will leave room for the new one once the weather is warm again.
Winterization of other non-resistant aquatic plants can be achieved by treating them as indoor plants. Examples of this are the sweet flag, taro, papyrus and umbrella palms. Simply store them in a saucer filled with water and place them in a sunny window, or use a grow light on a timer for 12 to 14 hours a day. How do you winterize pond plants? Pond plants appear to be segregated into their own class of plants, but they are not that different from normal plants.
Non-hardy garden plants need protection in winter, just like non-hardy pond plants. The most resistant of both groups can be left alone for the most part. Some of the plants on this super-resistant list include irises, sweet flag, reeds, grasses, marsh marigold and horsetail. Tropical Shallow Water Plants Like tropical water lilies, shallow water plants should continue to grow during the winter months.
Growth will slow significantly as daylight hours decrease. Umbrella palm, dwarf papyrus, giant small papyrus and white Arum lilies will survive the winter indoors and make excellent indoor plants. Other varieties are best treated as annuals. Some hardy fringe plants must winter at the bottom of the pond or in two feet or more of water.
For water gardeners living in Zone 5 or lower, these plants include thalia, pickerel, lobelia, melon sword, and water parsley. Do not allow the tuber or rhizome of these plants to undergo actual freezing of water or to be covered with ice, as this will cause the plants to become mush and not return in the spring. When the weather cools and the first frost hits the pond, place the pot at the bottom of the pond or at a depth of 18 inches or more of water. Now is the time to classify aquatic plants to determine a course of action for pond plant care during the winter.
Then lower the pot to the bottom of the pond, where the temperature stays a few degrees higher throughout the winter. For example, in zone 5, marigolds in swamps grow in very shallow water (actually ditches), so they do well in a very shallow pond. Most pond plants remain dormant in winter and top growth disappears, as do perennials that grow in the ground. Removing decaying leaves and other debris that has fallen into the pond will help reduce toxic gases, such as hydrogen sulfide, that build up in the pond during the winter.
Keep the plant in a swampy area around your pond and you can expect it to grow back every winter. Oxygenating water plants that are resistant to at least Zone 5, such as coconut tail and Italian veil, should be trimmed three to four inches and left at the bottom of the pond. However, here is a list of cold-resistant pond plants that you can expect to return triumphantly in the spring. Simply cut off any leaves that have turned yellow and immerse the pots in a deep section of the pond where the water is warmer during the winter.
If you prefer to winter your hardy water plants in your above-ground pond, simply install a pond heater. Any part of the plant that is close to the surface of the pond can freeze, so you can sink it deeper into the pond or trim the tops of the plants. It's a good idea to trim, the tips are back just above the crown in late fall and remove the cuttings from the pond. Floating aquatic plants, such as water lettuce and water hyacinth, can be removed from the pond before winter and can be made into compost.