Stop mold on seedlings8/11/2023 I suspect that the presence of peat moss in most seed starting mediums has something to do with it as well.Īlgae growth occurs most often indoors or in greenhouse conditions. What causes white mold or green algae on seedling soil?Įxcess water, light exposure, poor air circulation, and/or humidity causes green algae on top of seedling soil. It doesn’t need light to grow but does like moisture and organic matter.Ī little algae growth on one of our tomato seedlings. Algae is more closely related to plants, and requires sunlight or bright light to grow. Mold will look more fuzzy, raised, lacy, and usually white, yellowish or gray in color. Algae appears as green residue or mossy-looking film. It is mostly likely some sort of algae or moss growth, not mold. What is the green stuff on top of my seedling soil? So, let’s do a quick Q&A about what that green stuff is, if it’s bad for your seedlings or not, and how to prevent or fix it! We’ll also talk about white mold on seedling soil. Then folks always ask about it when they see our seedlings on Instagram, which is actually what inspired me to write this post. Have you ever had a green substance grow on top of your seedling soil, and wondered “ what’s up with that?” Well, you’re not alone! Our seed starting soil sometimes gets a little green tint too. Molds that grow on your seedlings do not harm the plant.Share on Pinterest Share on Facebook Share on Twitter Share on Email Share on Reddit Its growth is more of an indication that your soil is too wet. Overly moist soil can quickly rot the fragile roots of the seedlings. If the roots are dead, eventually, the rest of the plant will follow. This article will present to you seven ways on how to prevent mold with seedlings in small greenhouse. Now, it’s time for you to learn how to prevent mold with seedlings in small greenhouse. In this section, we have compiled the necessary steps so that everything will be easier for you. There is a range in temperature in which your plants can best photosynthesize. Keep the temperature inside your greenhouse between 77 to 82F. Anything above this can overheat your plants, especially if there is a heating mat present under the seedlings. So, the first thing you need to do on how to prevent mold with seedlings in small greenhouse is to manage the temperature. The most common reason why molds grow on seedlings is because of overwatering. Since watering is an essential task done to help seedlings sprout, people tend to forget that giving plants too much water can harm them. To solve this problem, use your finger and determine if the soil is dry. If it is, then that is the time you should water your seedlings. Simple and easy, but often neglected.Īnother way to prevent overwatering is by applying the water from the bottom system. This type of watering system ensures that the top part of the soil remains dry while the roots get to soak in the water from the bottom.ĭo not leave the water under the tray for too long, though. Make sure after 30 minutes, you throw out the remaining water inside. Keeping stagnant water will damage your plant more than benefiting from it. If you already understand how to manage water for your plants, you can deal with how to prevent mold with seedlings in small greenhouse. The best way to prevent mold growth is by improving the air circulation inside your greenhouse. Install an oscillating fan in the greenhouse and let the air blow directly on the seedlings. If you have a cover laid over your seedling trays, don’t forget to open them up so airflow can increase. Having good air circulation has more benefits than just keeping your soil dry and preventing mold and fungal growth. That is why we highly recommend this advice because you get more benefits than one. When you do follow this recommendation, pay close attention to the moisture level of your soil. The soil dries up quickly when there is a fan present. Yes, you need the soil to be dry, but not to the extent that there is no moisture left. The basic needs of a plant are water and sunlight. In this case, though, avoid letting your seedlings be under direct sunlight, especially when you have covers over the trays. Covered seedling trays trap the heat inside, therefore making the environment too hot, which damages the seedlings. On average, per day, most seedlings need a few good hours of robust and indirect light. Research more on how much indirect light does your seedlings need so you can be confident about how long you will let it be under the light. Overcrowding of seedlings can lead to less air circulation within your plants. And as we have stated above, one great way to prevent the growth of molds is with proper air circulation.Ī way to solve this problem is by thinning out your seedlings. This method means pulling out a few seedlings from their trays. It gives more space to your seedlings to grow and avoids the crowding situation.
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