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What is Silica? Why should I use it?


Silica . . . ahhhhh, Silica. Well, technically, Silicon Dioxide, but still. Silica is an organic compound with a ridiculous amount of benefits for your plants. Silica increases the strength of cell walls, actually fortifying the cells from the inside out. Stronger cell walls are good, this means your plant will be able to support the weight of the flowers, fruit, and/or buds you’ll eventually see.

Silica also increases resistance to stress – due to both climate (helps plants withstand extreme temps, both high and low – which is great if you live somewhere with a big temperature variance between day and night) and drought. Silica protects your plants against drought in a really cool way – it actually forms a protective coating on an intracellular level, which decreases the amount of water loss through transpiration – this is great because your plants will be able to withstand a drought much longer than plants not treated with silica.

Silica increases resistance to pathogens, too, including powdery mildew. Now, if you’ve ever dealt with powdery mildew, you KNOW what a big deal that is!!! If you haven’t dealt much with powdery mildew, or just want to know more about it, check out the blog we wrote on it: here. Basically, the plants build up an additional mineral barrier, using the silica, which lines the cells and makes it more difficult for diseases and pathogens to penetrate the plant at all. Silica also helps the plant resist sucking bugs by accumulating in the outer walls of leaves – when used as a foliar spray, you’ll see good results.

Also, Silica increases the metabolic rate in your plants, and, just for fun, silica has been shown to increase chlorophyll concentrations. This is great, because your plants will be greener, and you also see less wilt to your leaves.

So . . . why can’t I just use Potassium Silicate for all those things? Well . . . you can. However, potassium silicate is not listed as an organic product, whereas Silicon Dioxide is. There are many of the same properties among both substances, but if you are looking for an organic way to increase cell strength, metabolism, and resistance to pathogens and environmental factors, then Silicon Dioxide (silica) is most definitely the way to go!

Silicon Dioxide (Silica)

So when is it good to use Silica? Should I use it in the grow cycle or the bloom cycle? That’s an excellent question – so far, we’ve seen benefits to Silica in every stage. So basically, from seed to fruition. Plants grown in soil tend to uptake trace amounts of silica from the soil, whereas if you are a hydroponic gardener, there is no silica in your growing medium unless you manually add it in!

Also, plants grown with silica tend to show less shock during root growth from transplanting, as well as the flowers having a longer shelf life than those grown without silica.


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6 thoughts on “What is Silica? Why should I use it?

  1. I noticed that your silica dioxide is 65% silica and 5% Potash. Azomite is 65.85% silica dioxide and 5.23 % Potassium oxide. I currently use Azomite in my 20 bucket hydroponic setup. When would you use plain silica dioxide and when would you use Azomite?

  2. Great question. Look at Azomite and Silica as 2 different minerals containing silica. They are both a mined mineral. Azomite has a lot more trace minerals than the Silica. You can use them both at the same time as the plant will uptake as much silica as it can and avoid the rest. Overloading it will never burn the plants. Happy to answer any other questions.



  3. Can I add it to my soil or just mix it in the water?

    1. Hi, you can use silica as a soil amendment or mix it in water. I would use 3 TBSP per bag of soil, or follow the mixing directions to make a liquid concentrate and feed that way. I like to do a little of both.



  4. As far as I know, not only is potassium silicate legal organically (although it is a manufactured product), but virtually all of the liquids on the market are derived from the same potassium silicate source. I may well be wrong about this. I do have a question, though: can I use a little kelp help in a foliar silica spray?

    1. All the goodness contained in the kelp will basically be destroyed as soon as contact is made with the potassium silicate. If you are using our Silica Powder found here you can use the kelp in the foliar spray. Our silica is a natural and organic silica source derived from EARTH.

      Potassium Silicate and silica products derived from potassium silicate are not organic, it is a synthetically products substance. Good questions. Thanks!

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