First off, plants are a huge part of the pond ecosystem and need to be there to make sure everything lives harmoniously. Pond plants also enhance the beauty of any water feature. So, when your pond plants aren’t healthy, you know it. One sign that there’s something wrong is yellowing leaves. Here are some of the more common reasons why your pond plants are turning yellow.
Healthy pond plants love fertilizer!
Be sure to fertilize your pond plants. If your plants are potted (which is what we recommend) poke a hole in the soil and push the fertilizer down inside, then carefully close the soil over the hole. Fertilizer should also be added whenever re-potting your plants is necessary. For floating plants, remove them from the pond and place them in a container that will hold water. Add your favorite water-soluble fertilizer according to the directions. Do not add more than the recommended amount. Too much fertilizer can cause plants to turn yellow too.
Healthy pond plants and Insects
Inspect your pond’s plants just like you do your other plants. Pond plants are not immune to insects, especially in the winter if you bring them in the house.
Spider mites love the dry winter environment our homes have. Any insecticide that you can use on houseplants is safe to use on water plants inside the home. Aphids are sometimes problems in the house, but mites are more prevalent.
Aphids are usually the main insects to attack pond plants. Depending on the plant, you may be able to wash them off in the water where they will become yummy treats for your fish. Floating plants like hyacinths, water lettuce and lily pads and their flowers are good candidates for this. When you do water changes or add water to your pond due to evaporation, spray the water on the plants. This will wash the insects off too.
Too Much Sun
Healthy pond plants can burn just like us. A sunburned plant will have a bleached look or brownish cast to the leaves, sometimes they will yellow. When moving pond plants outside, if they have spent the winter inside, do it gradually. Move them first to a shady spot. Set the pot in a larger container that will hold water. Gradually over a 2-week period expose the plants to more sunlight. Do this in the spring when the weather begins to warm so that they also get used to the cooler nighttime temperatures.
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