Setting Seed Once zinnias flower, they will naturally turn brown and die.Īgain, zinnias are annuals. But your flowers are not typically going to bloom past autumn, depending on your climate. The best way to avoid severe frost damage is to cover the plants in the winter when it gets too cold. There’s no real way to prevent zinnias from dying off in the winter. Always choose a well-draining site in your garden to plant your zinnias to prevent issues from waterlogged conditions. If you notice this happening and you’ve been watering your zinnias regularly–stop. Due to lack of oxygen, the roots will begin to wither, and you’ll begin to notice the plant leaves turning brown around the edges. In waterlogged conditions, the soil pore space (the space between soil particles) is entirely full of water, and therefore no or very little oxygen is available to the plant roots. While water is important for plants, plant roots also need oxygen. What does this mean? It means the soil is either not draining or there has been too much water in the soil. More commonly, zinnia plants can also suffer when they’re waterlogged. Waterlogged Too much water can also cause problems for zinnias, ultimately killing them. If your zinnia’s leaves are brown and crispy, it’s likely too far gone to save. As long as the plant isn’t turning brown, then adjusting your watering schedule should bring them right back with a little time. Even if the plant does survive, drought stress can cause long-lasting and permanent effects on a plant and its future growth. If the plant has reached the point at which it’s turning brown and dying due to lack of water, it is likely too late to revive the plant. Wilting can be corrected rather quickly if the plant is given ample moisture to recuperate. The leaves will droop and shrivel and, if the situation isn’t corrected, they will begin to turn brown and die. One of the first signs that your plants aren’t receiving enough water is wilting. If you’ve been experiencing drought conditions and your zinnias are starting to die, it’s likely due to a lack of water. Lack of Water One of the more obvious reasons zinnias turn brown is due to not getting enough water.Įven though zinnias do not require a lot of water, there is a point where they do need some water. Leaf spot is typically easier to treat compared to other fungal infections, and if treated early, your plant will have a better chance of survival. Leaf spot is also a fungal infection treated by a commercially based fungicide. If lesions are bad enough on the stems they can cause girdling of the stem, where the top portion of the plant will subsequently wilt and die off due to the vascular system being cut off. Seriously infected zinnia plants will have leaves that turn brown and shrivel quickly from Alternaria leaf spot, and brown lesions can form on the stems. The spots may eventually become holes as the decaying plant tissue falls out. You may notice dark, concentric rings on the inside of the infected lesion. These spots will expand and become irregular in shape and turn dark red, brown, or purplish in color. Unfortunately, leaf spots affect many different types of flowers. If you begin to notice small, dark, circular, reddish spots with white to grayish-white centers on the leaves of your zinnias, your plant may have been infected by the fungus Alternaria zinniae. Alternaria Leaf Spot or Blight Spots that are reddish with white-gray centers are a sign of blight. Let’s take a look at each reason, and how you can treat them. Depending on the cause for the browning of your leaves or flowers, your plant may or may not be recoverable. There are a number of different reasons this happens, and each of them typically has a different treatment. Now that you know a little bit about zinnias and why they’re so beloved, let’s dive into the reasons why your zinnias may be struggling in the garden.
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