Description

Plagron Silic Rock 500 ml – silicon fertilizer for stronger plants

Silic Rock by Plagron is a liquid silicon fertilizer that helps plants cope with a frequently overlooked problem – silicon deficiency. Silicon improves the uptake of nutrients essential for proper growth, and in Silic Rock it is present in a form that plants can easily absorb.

The product improves the uptake of phosphorus, calcium and micronutrients because silicon mobilizes less mobile nutrients present in the growing medium. Thanks to the carefully selected ratio of silicon to potassium, it strengthens cell walls and improves plant resilience. The main effects are stronger plant structure and better stress tolerance, so they may not always be visible immediately.

The 500 ml package is enough to prepare 500 liters of solution at the maximum dosage of 1 ml per liter of water.

Key features

  • supplements silicon deficiencies
  • improves the uptake of phosphorus, calcium and micronutrients
  • strengthens cell walls and improves plant resilience
  • silicon in an easily absorbable form, in an optimal ratio to potassium
  • for use throughout the entire growing period
  • high-yield concentrate: 1:1000 dilution

Composition and NPK analysis

  • NPK fertilizer: 1.5-0-1.7
  • Total nitrogen (N): 1.5%, including 1.0% organic nitrogen and 0.5% nitrate nitrogen
  • Water-soluble potassium oxide (K2O): 1.7%
  • Silicon dioxide (SiO2): 1.0%
  • Concentrate pH: approx. 1.5 (very low); conductivity (EC): 75 mS/cm; density: 1.08 g/ml
  • Appearance: clear, colorless, odorless liquid

Application

Silic Rock strengthens plants throughout the entire growing period – from young plants through flowering and fruiting – and is suitable for houseplants and tropical plants as well as vegetables and ornamental plants in the garden and greenhouse. It is intended for growing in soil and coco; due to its organic origin, it is not suitable for hydroponic growing methods such as NFT, DWC or aeroponics. The product can be combined with other fertilizers and additives, provided that Silic Rock is first thoroughly dissolved in water and the other products are added only afterward. Keep in mind that the highly acidic concentrate lowers the pH of the irrigation water.

Directions for use

  • Shake the bottle well before use.
  • Add a maximum of 1 ml of Silic Rock per 1 liter of water (1:1000) and mix thoroughly.
  • Only add the other fertilizers and additives after Silic Rock has dissolved.
  • Use the solution with every watering throughout the entire growing period.
  • If you use an irrigation system, flush the lines after use.

Safety and storage

The concentrate has a very low pH (approximately 1.5) – handle with care, read the label carefully before use and follow the warnings provided on it. Avoid contact with skin and eyes when measuring; wear protective gloves and goggles. Do not mix the undiluted concentrate with other products. In case of contact with skin, rinse immediately with plenty of water; in case of contact with eyes, rinse immediately with plenty of water and seek medical advice. Store in the original, tightly closed container, in an upright position, at a temperature of 0 to 35°C, out of reach of children and animals; protect from frost and direct sunlight. The product is not intended for consumption. The shelf life of an unopened package is 2 years from the date of manufacture.

Product information

  • Volume: 500 ml
  • Form: liquid concentrate
  • Type: silicon fertilizer NPK 1.5-0-1.7 with SiO2
  • Growing phase: entire growing period
  • Dosage: up to 1 ml per 1 liter of water
  • Manufacturer: Plagron (Bertels B.V.), Ospel, the Netherlands

Plagron Silic Rock 500 ml is a simple way to provide plants with silicon regularly with every watering.

Product form

Plagron Silic Rock 500 ml - silicon fertilizer that strengthens plants

500 ml 56,40 zł 1 L 85,30 zł

56,40 zł

    • Fast shipping within 24 hours
    • Premium quality

    Description

    Plagron Silic Rock 500 ml – silicon fertilizer for stronger plants

    Silic Rock by Plagron is a liquid silicon fertilizer that helps plants cope with a frequently overlooked problem – silicon deficiency. Silicon improves the uptake of nutrients essential for proper growth, and in Silic Rock it is present in a form that plants can easily absorb.

    The product improves the uptake of phosphorus, calcium and micronutrients because silicon mobilizes less mobile nutrients present in the growing medium. Thanks to the carefully selected ratio of silicon to potassium, it strengthens cell walls and improves plant resilience. The main effects are stronger plant structure and better stress tolerance, so they may not always be visible immediately.

    The 500 ml package is enough to prepare 500 liters of solution at the maximum dosage of 1 ml per liter of water.

    Key features

    • supplements silicon deficiencies
    • improves the uptake of phosphorus, calcium and micronutrients
    • strengthens cell walls and improves plant resilience
    • silicon in an easily absorbable form, in an optimal ratio to potassium
    • for use throughout the entire growing period
    • high-yield concentrate: 1:1000 dilution

    Composition and NPK analysis

    • NPK fertilizer: 1.5-0-1.7
    • Total nitrogen (N): 1.5%, including 1.0% organic nitrogen and 0.5% nitrate nitrogen
    • Water-soluble potassium oxide (K2O): 1.7%
    • Silicon dioxide (SiO2): 1.0%
    • Concentrate pH: approx. 1.5 (very low); conductivity (EC): 75 mS/cm; density: 1.08 g/ml
    • Appearance: clear, colorless, odorless liquid

    Application

    Silic Rock strengthens plants throughout the entire growing period – from young plants through flowering and fruiting – and is suitable for houseplants and tropical plants as well as vegetables and ornamental plants in the garden and greenhouse. It is intended for growing in soil and coco; due to its organic origin, it is not suitable for hydroponic growing methods such as NFT, DWC or aeroponics. The product can be combined with other fertilizers and additives, provided that Silic Rock is first thoroughly dissolved in water and the other products are added only afterward. Keep in mind that the highly acidic concentrate lowers the pH of the irrigation water.

    Directions for use

    • Shake the bottle well before use.
    • Add a maximum of 1 ml of Silic Rock per 1 liter of water (1:1000) and mix thoroughly.
    • Only add the other fertilizers and additives after Silic Rock has dissolved.
    • Use the solution with every watering throughout the entire growing period.
    • If you use an irrigation system, flush the lines after use.

    Safety and storage

    The concentrate has a very low pH (approximately 1.5) – handle with care, read the label carefully before use and follow the warnings provided on it. Avoid contact with skin and eyes when measuring; wear protective gloves and goggles. Do not mix the undiluted concentrate with other products. In case of contact with skin, rinse immediately with plenty of water; in case of contact with eyes, rinse immediately with plenty of water and seek medical advice. Store in the original, tightly closed container, in an upright position, at a temperature of 0 to 35°C, out of reach of children and animals; protect from frost and direct sunlight. The product is not intended for consumption. The shelf life of an unopened package is 2 years from the date of manufacture.

    Product information

    • Volume: 500 ml
    • Form: liquid concentrate
    • Type: silicon fertilizer NPK 1.5-0-1.7 with SiO2
    • Growing phase: entire growing period
    • Dosage: up to 1 ml per 1 liter of water
    • Manufacturer: Plagron (Bertels B.V.), Ospel, the Netherlands

    Plagron Silic Rock 500 ml is a simple way to provide plants with silicon regularly with every watering.

    Frequently Asked Questions - FAQ

    Do you ship orders to the entire European Union?

    Yes, we ship to all countries in the European Union. The cost and delivery time depend on the destination country, the chosen shipping method, and current logistical conditions.

    Can I pay cash on delivery (COD)?

    Cash on delivery is available in selected European Union countries. Available payment methods are always displayed during the checkout process, depending on the delivery country.

    Where can I find sowing and cultivation instructions?

    Instructions and guides on sowing and plant care can be found in the product descriptions and on our blog, where we regularly publish educational materials. Additionally, we include a printed instruction manual with every order.

    Are the seeds sold legal and safe?

    Yes, all products offered by Mr.seed are legal and marketed in accordance with applicable regulations and the guidelines of phytosanitary institutions.

    Where do the seeds come from?

    Our seeds come from trusted producers and direct sources around the world. We collaborate with plantations, botanical gardens, and experienced seed collectors.

    How quickly are orders shipped?

    We ship most orders on the same or next business day. During busy periods, such as peak season or holidays, processing time may extend up to 72 hours.

    Where can I find answers to more questions?

    You can find an extensive database of answers on the full FAQ page, where we cover in detail topics such as orders, shipping, payments, cultivation, and products.

    👉 [Go to the full FAQ]

    Footer image

    © 2026 mr.seed, Shopify Technology

    • PL (PLN zł) PL (PLN zł)
    • English flag English flag
    • American Express
    • Apple Pay
    • Bancontact
    • BLIK
    • Google Pay
    • Klarna
    • Maestro
    • Mastercard
    • MB WAY
    • MobilePay
    • PayPal
    • Union Pay
    • Visa