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Description

Worm Castings Are the Organic Fertiliser That Boosts Plant Health Naturally

Worm castings are the ultimate upgrade for your potting mix. This chemical-free, natural plant food delivers a steady stream of nutrients and living microbes to your soil, helping your houseplants grow stronger, bigger, and more resilient. At Sybotanica, we source ultra-fresh, nutrient-dense worm castings that sometimes still include a few live worms—don’t worry, they’re completely harmless and just proof of freshness!

Unlike synthetic fertilisers that give a nutrient spike and crash, worm castings provide slow release nutrients through microbial processes. This not only feeds your plants but also builds a healthier, more active soil ecosystem.

What Makes Worm Castings Superior to Compost?

Rich in minerals, enzymes, and organic matter, worm castings offer a more refined, stable nutrient profile than standard compost. They serve as a dual-action soil amendment: enriching your mix while actively supporting microbial activity. Worm castings improve soil structure, increase water retention, and help roots access nutrients more effectively.

Benefits of Worm Castings at a Glance:

  • Complete organic fertiliser with balanced nutrients
  • Packed with beneficial bacteria and fungi to promote microbial life
  • Long-lasting, slow release nutrients that won’t leach away
  • Enhances root growth and plant resilience
  • 100% chemical free and safe for all houseplants
  • Comes in resealable bags to stay moist and active

This earthworm humus not only feeds your plants—it transforms your soil into a living, breathing support system for sustained growth.

Bonus tip: adding lava gravel will help with micronutrient release and acts as a super combo with this product.

A Microbial Powerhouse for Your Soil Ecosystem

Worm castings are teeming with microbial life that fuels the natural nutrient exchange in soil. These microbes play a key role in breaking down organic material, unlocking micronutrients, and improving nutrient uptake. As a root growth booster, this enriched medium helps plants absorb exactly what they need, when they need it—leading to healthier leaves, stronger stems, and more vibrant growth.

Whether you’re mixing your own potting blend or enriching your existing substrate, worm castings integrate seamlessly as a potting mix additive or top dressing.

Why Choose Worm Castings Over Synthetic Fertilisers?

Chemical fertilisers flood the soil with nutrients, but they’re often washed away during watering and can stress plant roots over time. In contrast, worm castings maintain a steady nutrient supply and resist nutrient loss through leaching. They work in harmony with your plant’s natural growth cycle, supporting steady development without the risk of overfeeding.

You won’t find strong smells, salts, or synthetic ingredients here—just a clean, odorless fertiliser packed with nature’s best.

A Sybotanica Essential for Happy Plants

At Sybotanica, we believe healthy soil leads to happy plants. That’s why we include worm castings in many of our SYBASoil blends, developed to match the unique needs of 16 plant families. These nutrient rich compost granules are the backbone of many thriving houseplants across Europe, and they’re a perfect fit for anyone creating their own mix at home.

From beginners to soil nerds, anyone can benefit from this sustainable fertiliser. Use it for propagation, potting, or simply to refresh tired soil. However you apply it, worm castings provide the building blocks for vibrant, long-lasting plant health!

Worm Castings Are the Organic Fertiliser That Boosts Plant Health Naturally

Worm castings are the ultimate upgrade for your potting mix. This chemical-free, natural plant food delivers a steady stream of nutrients and living microbes to your soil, helping your houseplants grow stronger, bigger, and more resilient. At Sybotanica, we source ultra-fresh, nutrient-dense worm castings that sometimes still include a few live worms—don’t worry, they’re completely harmless and just proof of freshness!

Unlike synthetic fertilisers that give a nutrient spike and crash, worm castings provide slow release nutrients through microbial processes. This not only feeds your plants but also builds a healthier, more active soil ecosystem.

What Makes Worm Castings Superior to Compost?

Rich in minerals, enzymes, and organic matter, worm castings offer a more refined, stable nutrient profile than standard compost. They serve as a dual-action soil amendment: enriching your mix while actively supporting microbial activity. Worm castings improve soil structure, increase water retention, and help roots access nutrients more effectively.

Benefits of Worm Castings at a Glance:

  • Complete organic fertiliser with balanced nutrients
  • Packed with beneficial bacteria and fungi to promote microbial life
  • Long-lasting, slow release nutrients that won’t leach away
  • Enhances root growth and plant resilience
  • 100% chemical free and safe for all houseplants
  • Comes in resealable bags to stay moist and active

This earthworm humus not only feeds your plants—it transforms your soil into a living, breathing support system for sustained growth.

Bonus tip: adding lava gravel will help with micronutrient release and acts as a super combo with this product.

A Microbial Powerhouse for Your Soil Ecosystem

Worm castings are teeming with microbial life that fuels the natural nutrient exchange in soil. These microbes play a key role in breaking down organic material, unlocking micronutrients, and improving nutrient uptake. As a root growth booster, this enriched medium helps plants absorb exactly what they need, when they need it—leading to healthier leaves, stronger stems, and more vibrant growth.

Whether you’re mixing your own potting blend or enriching your existing substrate, worm castings integrate seamlessly as a potting mix additive or top dressing.

Why Choose Worm Castings Over Synthetic Fertilisers?

Chemical fertilisers flood the soil with nutrients, but they’re often washed away during watering and can stress plant roots over time. In contrast, worm castings maintain a steady nutrient supply and resist nutrient loss through leaching. They work in harmony with your plant’s natural growth cycle, supporting steady development without the risk of overfeeding.

You won’t find strong smells, salts, or synthetic ingredients here—just a clean, odorless fertiliser packed with nature’s best.

A Sybotanica Essential for Happy Plants

At Sybotanica, we believe healthy soil leads to happy plants. That’s why we include worm castings in many of our SYBASoil blends, developed to match the unique needs of 16 plant families. These nutrient rich compost granules are the backbone of many thriving houseplants across Europe, and they’re a perfect fit for anyone creating their own mix at home.

From beginners to soil nerds, anyone can benefit from this sustainable fertiliser. Use it for propagation, potting, or simply to refresh tired soil. However you apply it, worm castings provide the building blocks for vibrant, long-lasting plant health!

Technical data
Value's (EN)Worm Castings
Country of OriginNetherlands
Suitable for organic farmingyes
Structural stability2-4 months, depending watering, active biofauna and other components it is mixed with
pH6,4
Specific value's for this product:C/N Ratio 19, Ruw as 233 gRAS/kg
Safe for pets?pet safe
Organic matter %31,4%
Dry matter %42,6%
*Values may vary slightly, no rights can be taken from this data.
Value's (EN)Worm Castings
Country of OriginNetherlands
Suitable for organic farmingyes
Structural stability2-4 months, depending watering, active biofauna and other components it is mixed with
pH6,4
Specific value's for this product:C/N Ratio 19, Ruw as 233 gRAS/kg
Safe for pets?pet safe
Organic matter %31,4%
Dry matter %42,6%
*Values may vary slightly, no rights can be taken from this data.
Storage tips
Our Worm castings works best when fresh, which is why we recommend storing it for about 6 months. Make sure to store it cool, dark and closed off.
Our Worm castings works best when fresh, which is why we recommend storing it for about 6 months. Make sure to store it cool, dark and closed off.

Worm Castings

Worm Castings

Premium SYBASoil

Regular price €17,99
Regular price €23,97 Sale price €17,99
Tax included.
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Natural complete fertiliser for most houseplants

Rich in essential nutrients and micro-organisms for healthy growth and aids in protection against pests such as spider mites and aphids.

Size:

In stock

Estimated Shipping Widget will be displayed here!

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100% Satisfaction Guarantee Or Your Money Back!

We guarantee a 100% satisfaction! Our mission is to help you get happy plants.

If for some reason we fail to do this, just contact us via info@sybotanica.com or return your items hassle-free within 30 days.

Not convinced? Check out our Trustpilot reviews

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Socially responsible production

At Sybotanica we not only want to make plants happy, but people happy as well. In our production team we exclusively hire people with a distance from the workforce, and help them rehabilitate to the normal working life.


Take Peter for example:

Peter has been with Sybotanica since the 1st hour, and has now been promoted to head of production & a permanent contract! Where he was the first employee, he now manages a team of 3 production workers.

What makes this achievement even more impressive is that Peter achieved all this with only 10% visibility! 🕶️ With a few minor adjustments to his working environment, Peter is able to perform his job 100%.

Peter has now been through two moves and knows all the ins & outs of Sybotanica. He can even feel by the potting soil which variety it is. That's quite a challenge with 16 different mixes!

We are confident that Peter will keep production running smoothly in the coming years too! 💪

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Description

Worm Castings Are the Organic Fertiliser That Boosts Plant Health Naturally

Worm castings are the ultimate upgrade for your potting mix. This chemical-free, natural plant food delivers a steady stream of nutrients and living microbes to your soil, helping your houseplants grow stronger, bigger, and more resilient. At Sybotanica, we source ultra-fresh, nutrient-dense worm castings that sometimes still include a few live worms—don’t worry, they’re completely harmless and just proof of freshness!

Unlike synthetic fertilisers that give a nutrient spike and crash, worm castings provide slow release nutrients through microbial processes. This not only feeds your plants but also builds a healthier, more active soil ecosystem.

What Makes Worm Castings Superior to Compost?

Rich in minerals, enzymes, and organic matter, worm castings offer a more refined, stable nutrient profile than standard compost. They serve as a dual-action soil amendment: enriching your mix while actively supporting microbial activity. Worm castings improve soil structure, increase water retention, and help roots access nutrients more effectively.

Benefits of Worm Castings at a Glance:

  • Complete organic fertiliser with balanced nutrients
  • Packed with beneficial bacteria and fungi to promote microbial life
  • Long-lasting, slow release nutrients that won’t leach away
  • Enhances root growth and plant resilience
  • 100% chemical free and safe for all houseplants
  • Comes in resealable bags to stay moist and active

This earthworm humus not only feeds your plants—it transforms your soil into a living, breathing support system for sustained growth.

Bonus tip: adding lava gravel will help with micronutrient release and acts as a super combo with this product.

A Microbial Powerhouse for Your Soil Ecosystem

Worm castings are teeming with microbial life that fuels the natural nutrient exchange in soil. These microbes play a key role in breaking down organic material, unlocking micronutrients, and improving nutrient uptake. As a root growth booster, this enriched medium helps plants absorb exactly what they need, when they need it—leading to healthier leaves, stronger stems, and more vibrant growth.

Whether you’re mixing your own potting blend or enriching your existing substrate, worm castings integrate seamlessly as a potting mix additive or top dressing.

Why Choose Worm Castings Over Synthetic Fertilisers?

Chemical fertilisers flood the soil with nutrients, but they’re often washed away during watering and can stress plant roots over time. In contrast, worm castings maintain a steady nutrient supply and resist nutrient loss through leaching. They work in harmony with your plant’s natural growth cycle, supporting steady development without the risk of overfeeding.

You won’t find strong smells, salts, or synthetic ingredients here—just a clean, odorless fertiliser packed with nature’s best.

A Sybotanica Essential for Happy Plants

At Sybotanica, we believe healthy soil leads to happy plants. That’s why we include worm castings in many of our SYBASoil blends, developed to match the unique needs of 16 plant families. These nutrient rich compost granules are the backbone of many thriving houseplants across Europe, and they’re a perfect fit for anyone creating their own mix at home.

From beginners to soil nerds, anyone can benefit from this sustainable fertiliser. Use it for propagation, potting, or simply to refresh tired soil. However you apply it, worm castings provide the building blocks for vibrant, long-lasting plant health!

Worm Castings Are the Organic Fertiliser That Boosts Plant Health Naturally

Worm castings are the ultimate upgrade for your potting mix. This chemical-free, natural plant food delivers a steady stream of nutrients and living microbes to your soil, helping your houseplants grow stronger, bigger, and more resilient. At Sybotanica, we source ultra-fresh, nutrient-dense worm castings that sometimes still include a few live worms—don’t worry, they’re completely harmless and just proof of freshness!

Unlike synthetic fertilisers that give a nutrient spike and crash, worm castings provide slow release nutrients through microbial processes. This not only feeds your plants but also builds a healthier, more active soil ecosystem.

What Makes Worm Castings Superior to Compost?

Rich in minerals, enzymes, and organic matter, worm castings offer a more refined, stable nutrient profile than standard compost. They serve as a dual-action soil amendment: enriching your mix while actively supporting microbial activity. Worm castings improve soil structure, increase water retention, and help roots access nutrients more effectively.

Benefits of Worm Castings at a Glance:

  • Complete organic fertiliser with balanced nutrients
  • Packed with beneficial bacteria and fungi to promote microbial life
  • Long-lasting, slow release nutrients that won’t leach away
  • Enhances root growth and plant resilience
  • 100% chemical free and safe for all houseplants
  • Comes in resealable bags to stay moist and active

This earthworm humus not only feeds your plants—it transforms your soil into a living, breathing support system for sustained growth.

Bonus tip: adding lava gravel will help with micronutrient release and acts as a super combo with this product.

A Microbial Powerhouse for Your Soil Ecosystem

Worm castings are teeming with microbial life that fuels the natural nutrient exchange in soil. These microbes play a key role in breaking down organic material, unlocking micronutrients, and improving nutrient uptake. As a root growth booster, this enriched medium helps plants absorb exactly what they need, when they need it—leading to healthier leaves, stronger stems, and more vibrant growth.

Whether you’re mixing your own potting blend or enriching your existing substrate, worm castings integrate seamlessly as a potting mix additive or top dressing.

Why Choose Worm Castings Over Synthetic Fertilisers?

Chemical fertilisers flood the soil with nutrients, but they’re often washed away during watering and can stress plant roots over time. In contrast, worm castings maintain a steady nutrient supply and resist nutrient loss through leaching. They work in harmony with your plant’s natural growth cycle, supporting steady development without the risk of overfeeding.

You won’t find strong smells, salts, or synthetic ingredients here—just a clean, odorless fertiliser packed with nature’s best.

A Sybotanica Essential for Happy Plants

At Sybotanica, we believe healthy soil leads to happy plants. That’s why we include worm castings in many of our SYBASoil blends, developed to match the unique needs of 16 plant families. These nutrient rich compost granules are the backbone of many thriving houseplants across Europe, and they’re a perfect fit for anyone creating their own mix at home.

From beginners to soil nerds, anyone can benefit from this sustainable fertiliser. Use it for propagation, potting, or simply to refresh tired soil. However you apply it, worm castings provide the building blocks for vibrant, long-lasting plant health!

Technical data
Value's (EN)Worm Castings
Country of OriginNetherlands
Suitable for organic farmingyes
Structural stability2-4 months, depending watering, active biofauna and other components it is mixed with
pH6,4
Specific value's for this product:C/N Ratio 19, Ruw as 233 gRAS/kg
Safe for pets?pet safe
Organic matter %31,4%
Dry matter %42,6%
*Values may vary slightly, no rights can be taken from this data.
Value's (EN)Worm Castings
Country of OriginNetherlands
Suitable for organic farmingyes
Structural stability2-4 months, depending watering, active biofauna and other components it is mixed with
pH6,4
Specific value's for this product:C/N Ratio 19, Ruw as 233 gRAS/kg
Safe for pets?pet safe
Organic matter %31,4%
Dry matter %42,6%
*Values may vary slightly, no rights can be taken from this data.
Storage tips
Our Worm castings works best when fresh, which is why we recommend storing it for about 6 months. Make sure to store it cool, dark and closed off.
Our Worm castings works best when fresh, which is why we recommend storing it for about 6 months. Make sure to store it cool, dark and closed off.
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FAQ

Can worm castings be used year-round for fertilizing?
Worm castings is a natural, complete fertiliser for your plants. It is the perfect replacement for chemical fertilizers, which can often burn your plant's roots due to their high concentration of minerals and salts.
Unlike liquid fertilizers, worm castings can be applied throughout the year without the risk of burn!

Is worm castings safe for my animals / children
Worm castings is a natural product and completely safe for animals, for example in a terrarium. However we do not recommend eating it, and keep it out of reach of children (yes, we have gotten this question before..)

What do we feed the worms?
Since worm castings are, quite literally, worm poop, it is common sense that feeding the worms high-quality food results in high-quality castings!
Organic dead plant matter, food waste, kitchen scraps, or other yard waste form the majority of the worms' diet.

Why choose worm castings over compost?
Though these products are similar, there are a few significant differences between compost and worm castings.

Worm castings exclusively consist of worm manure, while compost (while sometimes also containing worm castings) also contains lots of other decomposing plant waste and organisms.

The reason we prefer worm castings over compost is that it is a much more concentrated source of essential nutrients. Compost is also usually a lot more heavy and allows for little airflow, where worm castings has a better structure.

It also contains a much more versatile range of microorganisms, which are highly beneficial for plant health.

Have a different question? Get in contact

  • What:

    natural slow-release fertiliser full of essential nutrients and micro organisms

  • How much:

    Add 10-30% to your SYBASoil mix as a slow-release fertiliser

  • For which plants:

    Almost all houseplants

Why THIS Worm Castings compared to others?

Unsterilized amazingly fresh worm castings, nutrient rich and packed with beneficial microbes.

Unlike most worm castings that is sterilized (this kills most of the beneficial microbes) this one is full of them.

Consistent and dark texture, with a hazelnut like smell.

Origin of our Worm Castings

Our Worm Castings comes from a local Dutch farmer. Their worms' diet consists mainly of chicken feed and other biowaste. This diet is approved for organic farming in The Netherlands (from where we ship).

Most farms feed their worms (imported) paper pulp. Despite the sizable price gap (up to 2.5x as expensive), we stand by our choice of organically-fed worm castings.
The main reason for this is the environmental impact.

Judging from our tests, there is not that much of a difference in quality, which is why most farms choose to use paper pulp.
The species of worms used are the Dendrobaena Veneta, Eisenia Hortensis & Eisenia Fetida, also known as Tiger worms. Don't worry, they don't bite!

What are customers (and their plants) saying?