Kostky

Propagate seeds and cuttings effectively with rockwool cubes, starting from €0.04.

Explore small starter cubes and large propagation blocks. Covers seedling and vegetative stages in rockwool and hydro mediums.

Skip to results list
Availability
Price
to
The highest price is €702,14
Clear
Brand
28 items

Filter

Availability
Price
to
The highest price is €702,14
Brand
Shipping & Tracking. 3 day EU delivery

You'll get your package in 3-5 days no matter where you are in EU.

Cost is 7 to 15 EUR under 30kg.

We'll send you a tracking number as soon as your purchase dispatched.

You'll receive a notification on each stage of delivery

We use all the variety of shipping companies, if you have a prefered one - let us know, we'll send with it for your convinience.

See more on Shipping details page.
60 days returns

You can get a refund or replacement after up to 30 days from purchase.

But we ussualy stand on customers side, so we can give a 60 days time frame!
How to know right prodcut parameter?

See our free grow calculators for hydroponics and indoor gardening.

Estimate nutrients, lighting, VPD, irrigation, plant spacing, and grow planning.


Explore our tools
2 months post sale expert support

It's free.

We are a team of 10 with a decade of wise expirience in growing and gardening, so if you'll have any need of help, we'll guide you to your goal within 2 months from a purchase.
How to contact us?

Text us by:

Chat by Email

Chat on Whatsapp

Online chat - in lower right corner of any page of this website.
About us. Our 9 year history

GoToGarden started in 2017 out of personal frustration. Our founder was a hobby grower who spent hours navigating online shops that felt built by people who had never touched a plant — cluttered layouts, vague product descriptions, no real guidance on what to actually buy or why. He knew there had to be a better way.

See more on About us page

Estimate nutrients, lighting, VPD, irrigation, plant spacing, grow planning.

Our free calculators for hydroponics and gardening.

 Calculate

Chat with us, we're online

Chat on Whatsapp

Chat by Email

What rockwool cubes are best for starting seeds and cuttings?

For optimal root development from seed or cutting, choose inert rockwool cubes. These media offer a balanced water and air ratio crucial for early plant growth. For instance, Grodan Delta NG2.0 75x75x65 mm cubes with a 42x40 mm hole provide this environment, ensuring healthy initiation for hydroponic systems. This collection covers the seedling stage, with some products suitable for vegetative growth, utilizing rockwool as the primary medium.

Choosing the right Grodan rockwool cubes for your grow

This extensive Grodan collection spans from micro-sized starter cubes to large-format growing blocks, catering to every scale. Options range from the minuscule Grodan GroCube 10x10x10 mm, kostičky /products/grodan-grocube-10x10x10-mm-kosticky-1-litr to the substantial Grodan 150x150x142 mm, pěstební kostky s dírou 42x40 mm, BOX 48 KS /products/grodan-150x150x142-mm-pestebni-kostky-s-dirou-42x40-mm-box-48-ks. Whether you need a single Grodan 36x36x40 mm, sadbovací kostka s dírou /products/grodan-36x36x40-mm-sadbovaci-kostka-s-dirou-1-ks or a bulk Grodan 40x40x40 mm, sadbovací kostky s dírou, BOX 2250 KS /products/grodan-40x40x40-mm-sadbovaci-kostky-s-dirou-box-2250-ks, this range ensures a perfect fit. For transplanting, consider the Grodan Smart Tray 504x240x50 mm /products/grodan-smart-tray-504x240x50-mm, designed to hold various cube sizes. Explore sibling collections like Rohože for broader substrate options.

Grodan vs. other rockwool brands

Grodan stands out as a leading brand in inert rockwool cultivation media. Unlike generic alternatives, Grodan cubes are engineered with specific cell structures for optimal air-to-water retention, promoting vigorous root expansion. This focus on precision engineering distinguishes Grodan for growers demanding consistent results in large-scale propagation and commercial cultivation.

How to select Grodan cubes for your propagation

Growers focusing on the seedling stage in rockwool or hydroponic systems typically start with smaller cubes like the Grodan 25x25x40 mm, sadbovací kostka s dírou /products/grodan-25x25x40-mm-sadbovaci-kostka-s-dirou-1-ks. For vegetative growth or larger plants, transition to 75x75x65 mm or 100x100x65 mm cubes such as the Grodan 100x100x65 mm, pěstební kostka bez díry 1 ks /products/grodan-100x100x65-mm-pestebni-kostka-bez-diry-1-ks. If using a tray system, ensure your cube dimensions match the tray slots, for example, 36x36mm cubes for the Smart Tray /products/grodan-smart-tray-504x240x50-mm. For easy cutting insertion, Grodan MACROPLUG 36/40 V-CUT LOOSE váleček /products/grodan-macroplug-3640-v-cut-loose-valecek-1-ks is an excellent choice.

Frequently Asked Questions

What is the difference between Grodan cubes with and without a hole?

Cubes with a hole are designed for easier seed or cutting insertion, while cubes without a hole offer a more uniform propagation surface. Both provide balanced water and air for root development.

Which Grodan cubes are best for starting seedlings?

For starting seedlings, smaller cubes like the Grodan 25x25x40 mm or 36x36x40 mm sizes are ideal. These provide a good balance of water and air for delicate root systems.

Can Grodan rockwool cubes be used in hydroponic systems?

Yes, Grodan rockwool cubes are widely used in hydroponic systems because they are inert and provide excellent aeration and water retention for root growth.