![]() ![]() As your seedlings grow larger, shade out the soil, soak up water more quickly, and their roots begin to dominate the soil medium, the algae growth will usually fade away on its own. That’s what ours usually does!Īlgae growth on seedling soil is a fairly common and natural occurrence, while mold may indicate your soil is contaminated or especially excessively wet. It’s especially common when the seedlings are very small, since the soil has more exposed surface area for light to reach. 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. Share on Pinterest Share on Facebook Share on Twitter Share on Email Share on Reddit ![]()
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