Plagron Silic Rock bottles in multiple sizes on a white background

Plagron Silic Rock 250 ml bottle on a white background

Plagron Silic Rock

Silicon strength support
Supplement to base feed
Check hydro use

Plagron Silic Rock adds silicon for stronger stems, better plant structure and extra resilience in soil or coco-grown plants. It suits heavy-leaved houseplants and plants under stronger lights. Use it as an add-on to a complete feed, not as a replacement for nutrition.

Quick facts

Type: Silicon additive
Substrates: Soil / potting mix and Coco
Dosage: 1 ml/L
Frequency: As needed
Skill level: Advanced
pH/EC: Recommended

€8,50

VAT included · plus

Please note: Most fertilizers ship separately from plants. A separate shipping fee may apply, and the final cost is calculated at checkout by order weight. Free shipping does not apply.

Size:

250 ml 500 ml 1 L

Variant

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Plagron Silic Rock adds silicon support to an existing feeding routine. It is chosen for plant resilience and structure, not because the plant lacks a base fertilizer.

Strengthening the plan

It suits advanced setups, fast growth and plants that benefit from extra structural support. Light, watering, roots and base nutrition still need to be right first.

Silicon has a specific role

Use CalMag Pro for calcium and magnesium balance, and use Terra, Alga, Cocos or Hydro products when the plant actually needs food. Silic Rock is the specialist silicon layer.

Is it right for your plant?

Substrate Soil / potting mixCoco
Best for Advanced setupsStressed plants
Helps with Stress recoveryActive growthRegular feeding
Choose another product for NFT, DWC or aeroponicsuntested pH-sensitive routinescomplete base feeding

Plagron Silic Rock is well suited to soil and coco plants where stronger tissue and stress tolerance are the goal. It fits large foliage plants, thin-stemmed growth and plants under stronger lights.

Plagron does not recommend it for NFT, DWC or aeroponics.

What's inside:

NPK Ratio: NPK 1.5-0-1.7 + 1% SiO2
Nutrient basis: Silicon additive

Plagron Silic Rock is a silicon additive with a small nutrient contribution. It belongs beside the base feed in setups where silicon support is wanted.

The formula is NPK 1.5-0-1.7 with 1% SiO₂. Keep it separate from complete feeding decisions and watch pH-sensitive routines.

How to use it

Use Plagron Silic Rock as follows: dose at a maximum of 1 ml/L during growth when silicon support is part of the plan. Mix into the watering solution and check pH afterwards in coco or hydro.

Apply consistently for a period; silicon support is gradual.

➜ A few notes before measuring, mixing or applying :

Keep it within the recommended dose because silicon products can affect pH and nutrient balance. Use one silicon product unless the total dose has been calculated.

Use the right base fertilizer alongside it for normal growth nutrition.

Plagron Silic Rock

€8,50

Frequently Asked Questions about Plagron Silic Rock

What is Plagron Silic Rock used for?

It is a silicon additive used for stronger tissue and stress tolerance. It is not a replacement for balanced NPK feeding.

Which plants can benefit from Plagron Silic Rock?

It suits soil and coco plants where stronger tissue is the goal, including larger foliage plants, thin-stemmed growth and plants under stronger lights.

Can Plagron Silic Rock be used in all hydro systems?

Use it for soil or coco feeding; avoid it in NFT, DWC and aeroponic systems. In coco feeding, check pH after mixing.

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