Plant Nutrition

Understanding The Role of Silicon in Plant Health

When most people think about fertilizing plants, they think about the major nutrients like nitrogen, potassium, phosphorus, calcium and magnesium. And there are quite a few other micronutrients that all play important roles in plant health, but arguably there is no other micro-nutrient as important as silicon for optimizing plant health. Silicon plays an integral role in plant health by interacting with several key components of plant stress signaling systems leading to induced resistance. The terminology is confusing because there are differences between silicon, silica, silicic acid and silicate. Sometimes they’re used interchangeably by the fertilizer industry but these terms mean very different things. So, here are the definitions of some common terms involved when talking about silicon in plants.

Silicon: a tetravalent nonmetallic element that occurs combined as the most abundant element next to oxygen in the earth’s crust. It is an element with the symbol Si and atomic number 14. The elemental form itself is unassimilable to plants.

Silica: another name for silicon dioxide (SiO₂); found in the mineral quartz and also a major component of sand. Sometimes you will find products that contain micronized silicon dioxide to be amended in or there is even liquid silicon dioxide as well.

Silicates: compounds containing silicon-oxygen tetrahedrons (SiO4)4-that are used as fertilizers like calcium silicate, potassium silicate, sodium silicate and combinations of diatomaceous earth with minerals.

Silicic Acid: any of various weakly acid substances obtained as gelatinous masses by treating silicates with acids. It is a compound of silicon, oxygen, and hydrogen, regarded as the parent substance from which is derived a large family—the silicates—of minerals, salts, and esters. The only form of silicon which is available for entry or uptake into a plant is silicic acid, Si(OH)4

Monosilicic Acid (MSA): Synonym: orthosilicic acid (OSA). MSA or Si(OH)4 is the simplest form of soluble silicic acid. MSA is found universally in seawater, river water and soils at a concentration of a few ppm. Although MSA is in dynamic equilibrium with disilicic acid, it is considered the only bioavailable form of silicon.

What’s the Difference?

Because most of the silicon in the plant’s crust is held in forms plants cannot take up. These include silicon dioxide (silica) and various silicate minerals. While plants can’t take up silica, they can take up another form of silicon —monosilicic/orthosilicic acid. Bacteria can convert other silicon compounds into monosilicic acid. However, this process takes weeks or months. By the time silicon is in a plant available form, the plant might be too far along in it growth cycle for the silicon to be of much value. Therefore, growers often apply silicon in the form of monosilicic acid.


Potassium silicate (K2SiO3) is a salt of silicic acid (H4SiO4).

As mentioned above, silicates are not available to plants. So, plants cannot take up or use potassium silicate. First, bacteria must convert it to monosilicic acid.

Therefore, applying potassium silicate does not have the same effects as applying monosilicic acid. Depending on the level of nutrient cyclying and silica solubilizing bacteria present in the soil or on the leaf surface (foliar application), your plants will not be able to uptake potassium silicate for potentially weeks, it just depends on a variety of biotic and abiotic factors.

Role of Silicon in Plant Health

Silicon promotes plant growth by increasing the growth of cells which leads to faster growth of the roots stems and shoots. A few studies have shown that the application of silicon yields plants with taller and thicker stems. Silicon also helps protect plants from harmful fungi.

Eventually, silicic acid molecules polymerize into insoluble silica, which is deposited in plant tissues, first in the abaxial (lower) epidermis and then, as the plant grows, in the epidermis. It then condenses into particles of hard, polymerized silica gel, also known as phytoliths. It is this silica that imparts silicon’s benefits to plants by strengthening plant tissues and structures.

Primary Effects on Plant Growth

Mono-silicic acid has three primary effects on plants:

  1. Mechanical – Builds structure and resistance to stress
    Deposits silicon directly into the outer layer of the cell creating a rigid barrier and a more solid structure.
  2. Nutritional – Increased and more balanced uptake of nutrients
    Pressurizes the plant sap to allow a better and more even flow of nutrients throughout the plant circulatory system.
  3. Immunity – Stimulates plant’s immune system
    Triggers the production of immunity compounds, as well as drawing silicon to the point of attack to rebuild and strengthen tissue.

Improves Resistance to Fungal and Bacterial Pathogens

Although it’s not fully known how, silicon helps protect plants against harmful fungi. Some of these fungi include fusarium wilt and powdery mildew. Scientists think one way this element protects plants is by stimulating plant defenses. When you add silicon to your plants, they can better recognize diseases and begin to fight back LINK

Natural Sources of Silicon

So now that we know a little more about the element silicon and its role in plant health, let’s examine where we can find natural source of it.

  1. Diatomaceous earth Diatomaceous earth, also known as diatomite and DE, is the naturally occurring fossilized remains of diatoms—single-celled aquatic algae. It is a near-pure sedimentary deposit consisting almost entirely of silica.
  2. Horsetail The plant horsetail has found extensive application as a source of silica, The results for the silicon concentration in horsetail reached from 2.64% to 4.80% of the dry matter. The lowest amount of silicon was in the range between 1.52% and 2.51%.

Dr. Duke’s Phytochemical and Ethnobotanical Databases provide some reference points to the values of silica and silicon in the plant and shoot tissue of Horsetail – Equisetum arvense (Equisetaceae)

Horsetail Garden Tea

Here is a quick recipe from No Dig Garden for a horsetail extract to apply as a drench or foliar for your plants,

•2 cups fresh horsetail or 1 cup dried

•10 cups water

•Bring to the boil, reduce the heat and simmer for 30 minutes with the lid on. Leave to cool overnight – you may want to pop it outside as it isn’t the nicest of smells and can make the kitchen smell a bit peculiar, not quite what you need first thing in the morning!

•Strain through a sieve or colander lined with muslin and pour into labelled bottles. Store in a cool place for about a month. Pour any leftover potion into a compost heap.

•To use as a foliar spray or soil feed, dilute 1 part horsetail ‘tea’ to 4 parts water.

Here is a recipe for a smaller quantity which can be increased as you wish.

2 cups fresh horsetail or 1 cup dried

10 cups water

Bring to the boil, reduce the heat and simmer for 30 minutes with the lid on. Leave to cool overnight – you may want to pop it outside as it isn’t the nicest of smells and can make the kitchen smell a bit peculiar, not quite what you need first thing in the morning!

Strain through a sieve or colander lined with muslin and pour into labelled bottles. Store in a cool place for about a month. Pour any leftover potion into a compost heap.

To use as a foliar spray or soil feed, dilute 1 part horsetail ‘tea’ to 4 parts water.


In summation, Silicon has been shown to elicit these types of effects on plants

  1. Have stronger and thicker branches by depositing silicon directly into the outer layer of the cell.
  2. Carry sturdier and heavier fruits with higher nutritional value and a longer shelf-life.
  3. Silicon induced thermotolerance – Improves plants tolerance to heat extremes.
  4. Are more resistant to stress caused by high concentrations of salts in the substrate (high EC).
  5. Alleviates abiotic and biotic stresses, and increases the resistance of plants to pathogenic fungi.

Other Research Articles on Silicon

Role of Silicon on Plant–Pathogen Interactions

Silicon Influences Soil Availability and Accumulation of Mineral Nutrients in Various Plant Species

Silicon and plant disease resistance against pathogenic fungi

Silicon-induced thermotolerance in Solanum lycopersicum L. via activation of antioxidant system, heat shock proteins, and endogenous phytohormones

The Effects of Foliar Sprays with Different Silicon Compounds

Agriculture increases the bioavailability of silicon, a beneficial element for crop, in temperate soils


Featured are some of the custom genetics bred by the Cannabis Horticultural Association here in Humboldt County

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Dynamic Accumulators – Nettle Nutrient Analysis

The Cannabis Horticultural Association (CHA) has embarked on a mission to re-analyze the potential of dynamic accumulators. Dynamic accumulators is a term used in the permaculture and organic farming literature to indicate plants that gather certain minerals or nutrients from the soil and store them in a more bioavailable form and in high concentration in their tissues, then used as fertilizer or just to improve the mulch layer. The first to use the term dynamic accumulator in the above definition was probably Robert Kourik in his book Designing and Maintaining Your Edible Landscape—Naturally (1986).

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Companion Planting with Cannabis

CHA members will now have access to our PowerPoint slides as we move into our workshop series. First up is a 72 slide presentation on companion planting with cannabis. It can be located on the “Companion Planting” members page. 

The Companion Planting for Cannabis workshop will go over all the categories of cover crops and highlight their roles in soil biology and plant fertility while addressing certain caveats when utilizing these systems. It will then transition into companion planting to cover a local case study on intercropping with cannabis. Following up with numerous studies on trap cropping and banker plants, showcasing the banker plants capabilities for sustaining beneficial predatory insects. Quite a few regional farms are showcased through their companion planting techniques and interviews with farmers help highlight clear management strategies. The companion planting with cannabis series is sure to share information on how to cut costs through integration of specific medicinal and nutritive plants designed to be optimized for your microclimate!

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Calcium’s role in Cannabis Physiology

“Calcium is an extremely important plant nutrient due to its many functions, which includes membrane structural integrity, maintenance of homeostasis, segregation of genetic material during cell division, gene expression, energetics and enzyme activities. The full picture of calcium-mediated physiological processes has not been fully described here nor clarified in academic research; however, researchers do know that calcium is immobile in plants and that it is a constant requirement throughout all growth phases.”

Mark June-Wells, Ph.D.

Visit Cannabis Business Times for an interesting article on the roles of Calcium in plant physiology…

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The Facts About Dynamic Accumulators


By John Kitsteiner

Within the world of Permaculture we often find reference to plants known as Dynamic Accumulators. In brief, this is the idea that certain plants (often deep-rooted ones) will draw up nutrients from the lower layers of the soil, and these nutrients will be stored in the plants’ leaves. When the leaves fall in autumn and winter and are broken down, those stored nutrients are then incorporated into the upper layers of the soil where other plants will benefit from their deposition….

Read the full article at Permaculture Research Institute.

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Harvest Rain, Harvest Flowers

Rainwater Tanks

By Lizandro Salazar

As more propositions pass, tax dollars accumulate, and growers slowly creep out of the woodwork, it’s becoming clear that the CA cannabis industry is entering into a new phase.

While regulators scratch their heads trying to figure out how to best approach this topic, it’s clear that “business as usual” may turn into “business unusual.” Many farmers groan as engineering fees, soil tests, and permitting costs raise the price of going “legal”, but some growers and professionals are nodding their heads in approval. What some view as bureaucracy, others see as a opportunity to ‘do things right.’ CA is the leader in agriculture in the US. We grow the food that feeds most of the country using Billions of gallons of water, mixed with countless chemicals. Is the cannabis industry going to follow the same path? Or are we going to create sustainable and resilient systems promoting renewable energy, zero pesticides and water sovereignty? I’d like to think the latter.

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One Bad Apple… Plant Growth Hormones and You

By: Luke A. Besmer

I am sure you’ve heard the old saying about how one bad apple spoils the bunch? Well it’s true, and of all things it’s due to a hormonal imbalance. Who’da thunk? So it turns out that in nature, the first ripe apple of the season drops to the ground and begins to decompose. During the decomposition process, the apple releases a gas called Ethylene. Ethylene is a Plant Growth Hormone (PGH) that triggers the nearby apples to fall to the ground and start the decomposition process. The sweet smell of all those decomposing apples attracts foraging animals who eat the apples and spread the seeds far and wide, often with a little fertilizer to boot (or conversely, to overwhelm scavengers so that some seeds are left undisturbed and able to safely germinate). Ethylene and other Plant Growth Hormones are vitally important to all aspects of plant growth and development, understanding them and their uses can improve any gardener’s yield.

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Fermented Plant Juice

“What Is Fermented Plant Juice (FPJ)?

FPJ is used in solutions for seed and soil treatments and plant nutrition. It consists of the young shoots of vigorously growing plants that are allowed to ferment for approximately 7 days with the aid of brown sugar. The brown sugar draws the juices out of the plant material via osmosis and also serves as a food source for the microbes carrying out the fermentation process. “

-University of Hawaii

The general overarching concept is the bacteria in the fermentation process use the sugars to breakdown the plant matter and convert it into a highly available solution of nutrients, hormones, enzymes, amino acids and microbes.

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